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    Terms beginning with C

    209 terms from the estate's acronym catalogue.

    C-17 Globemaster III
    US strategic/tactical airlift aircraft carrying 77 tons. Can operate from short austere runways. Primary strategic airlift platform for US and allied forces.
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    C-band
    Radio frequency band spanning 4-8 GHz. Historically favoured for tropical satellite communications due to minimal rain fade attenuation.
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    C-IED — Counter-Improvised Explosive Device
    The efforts and capabilities to defeat improvised explosive devices and attack the networks that employ them.
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    C-UAS — Counter-Unmanned Aircraft System
    Systems and techniques designed to detect, track, identify, and neutralise hostile drones using kinetic, electronic warfare, or directed energy methods.
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    C/N0 — Carrier-to-Noise Density Ratio
    Ratio of carrier power to noise spectral density, measured in dB-Hz.
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    C&DH — Command and Data Handling
    The spacecraft subsystem responsible for receiving, validating, and executing ground commands, and for collecting, formatting, and storing telemetry and payload data.
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    C2 — Command and Control
    The authority and capability to direct forces and coordinate operations. In joint operations, C2 structures must integrate capabilities across all domains rather than operating in service-specific silos.
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    C2C — Comply-to-Connect
    Framework ensuring devices meet security policy before being granted network access.
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    C2W — Command and Control Warfare
    The integrated use of operations to deny an adversary information while protecting friendly C2.
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    C3 — Characteristic Energy
    The measure of excess specific energy over that required to escape a gravitational body (km²/s²). Determines launch vehicle payload capability for interplanetary missions.
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    C4ISR — Command, Control, Communications, Computers, Intelligence, Surveillance, and Reconnaissance
    The integrated architecture of systems enabling military commanders to direct forces. Encompasses networks, data links, sensors, and processing systems across all domains.
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    C5I — Command, Control, Communications, Computers, Combat Systems and Intelligence
    The integrated systems supporting naval command, control and intelligence functions.
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    CA-CFAR — Cell-Averaging Constant False Alarm Rate
    A CFAR detector that sets the threshold from the average of surrounding reference cells.
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    CAA — Civil Aviation Authority
    A national body responsible for regulating civil aviation safety and operations within a country.
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    CAB — Combat Aviation Brigade
    An Army brigade providing attack, reconnaissance, assault, and medical evacuation aviation support.
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    CALL — Center for Army Lessons Learned
    The Army organization that collects, analyzes, and disseminates lessons and best practices from operations.
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    Call for Fire
    The standardised radio procedure used by a forward observer to request indirect fire from artillery or mortars. Includes target location, description, method of engagement, and method of fire control.
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    CAN bus — Controller Area Network
    Robust two-wire serial bus (up to 1 Mbit/s CAN classic; 5+ Mbit/s CAN-FD) using arbitration on message priority. Ubiquitous in automotive; also used in industrial and some aerospace ancillary systems. CANopen and J1939 are common application-layer protocols.
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    CANN — Cannibalization
    The authorized removal of a serviceable part from one asset to restore another to operational status.
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    CAP — Combat Air Patrol
    A patrol of fighter aircraft over a force or area to intercept incoming air threats.
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    Capella
    Capella Space — commercial X-band SAR constellation (~36 sats planned). Sub-metre resolution, all-weather day/night. Tasking via API.
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    Capstone Doctrine
    The 2008 UN foundational document for peacekeeping establishing three core principles: Consent of parties, Impartiality, and Non-use of force except in self-defence and defence of the mandate. Governs all UN peace operations.
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    CAS — Close Air Support
    Air operations against hostile targets in close proximity to friendly ground forces. Requires detailed coordination and terminal attack control to prevent fratricide.
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    CASB — Cloud Access Security Broker
    Policy enforcement point between users and cloud services that provides visibility and control.
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    CASEVAC — Casualty Evacuation
    The movement of casualties from the point of injury to medical care using any available transport. Distinct from MEDEVAC (medical evacuation), which uses dedicated medical platforms with en-route care.
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    CAST-32A
    FAA Certification Authorities Software Team position paper providing objectives for assurance of multicore processor (MCP) use in airborne software. Replaced operationally by AC 20-193 / AMC 20-193. Addresses interference channels, robust partitioning, and worst-case execution time on multicore.
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    Catalogue Maintenance
    The continuous process of updating orbital state vectors for thousands of tracked objects in the space situational awareness catalogue. Combines radar, optical, and telemetry inputs with batch least-squares or Kalman filtering.
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    CATF — Commander, Amphibious Task Force
    The naval officer commanding the amphibious task force during an amphibious operation.
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    CAV — Cavalry
    Reconnaissance and security forces that conduct scouting and screening operations for a larger force.
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    CBC — Cipher Block Chaining
    A block cipher mode where each plaintext block is XORed with the previous ciphertext block before encryption. Requires an initialisation vector (IV) for the first block. Provides confidentiality but not authentication.
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    CBM — Condition-Based Maintenance
    Maintenance performed based on the actual measured condition of equipment rather than fixed intervals.
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    CBRN — Chemical, Biological, Radiological, Nuclear
    Collective term for weapons of mass destruction categories and the defensive measures against them. CBRN defense includes detection, protection, decontamination, and medical countermeasures.
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    CBRNE — Chemical, Biological, Radiological, Nuclear, and Explosive
    CBRN hazards expanded to include high-yield explosive threats.
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    CCD — Charge-Coupled Device
    An image sensor converting photons to electrical charge. Susceptible to radiation damage: dark current increase from displacement damage, hot pixels from single particle strikes, and charge transfer efficiency degradation.
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    CCD_GEOINT — Coherent Change Detection
    A SAR technique that detects subtle scene changes between passes by comparing the coherence of complex imagery.
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    CCIR — Commander’s Critical Information Requirement
    Information the commander identifies as critical to timely decision-making.
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    CCMD — Combatant Command
    A unified command with a broad continuing mission under a single commander, established by the President.
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    CCP — Casualty Collection Point
    A location where casualties are assembled for evacuation to a higher level of medical care.
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    CCSDS — Consultative Committee for Space Data Systems
    An international organisation of space agencies that develops standards for space data and communications. Publishes recommended standards for TM/TC, file transfer (CFDP), time, image compression, and conjunction data messages.
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    CCW — Capability-Centric Warfare
    Organizing military operations around required effects rather than platform availability. Selects capabilities from any domain to achieve the desired outcome, breaking single-service reflexes.
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    Cd — Drag Coefficient
    Dimensionless coefficient characterizing atmospheric drag on a body. Typically 2.0-2.5 for spacecraft.
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    CDD — Capability Development Document
    A JCIDS document that captures information necessary to develop a proposed program, translating approved capability needs into specific performance attributes and system requirements.
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    CDE — Collateral Damage Estimation
    Analysis of expected civilian harm and unintended damage from a proposed military strike. CDE levels determine approval authority and may constrain weapon selection and timing.
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    CDH — Command and Data Handling
    Subsystem managing onboard data, commands and telemetry.
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    CDL — Common Data Link
    A standardised high-bandwidth data link for ISR sensor data transmission from platforms like Global Hawk, U-2, and Predator/Reaper to ground stations. Operates in Ku-band with data rates up to 274 Mbps.
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    CDM — Conjunction Data Message
    A standardised data product providing miss distance, time of closest approach, collision probability, and covariance data for two objects approaching in orbit.
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    CDMA — Code-Division Multiple Access
    Channel sharing via orthogonal spreading codes.
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    CDR — Critical Design Review
    A systems engineering milestone review evaluating the detailed design against requirements before authorising manufacturing. The last major review gate before hardware build.
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    CDRL — Contract Data Requirements List
    The list of all data deliverables a contractor must provide, including format, frequency, and distribution requirements.
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    CEC — Cooperative Engagement Capability
    A sensor-netting system that fuses radar data across ships for integrated air defense.
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    CEMA — Cyberspace Electromagnetic Activities
    The process of planning and synchronizing cyberspace and electronic warfare operations in support of a mission.
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    CEP — Circular Error Probable
    The radius of a circle centred on the aim point within which 50% of weapons are expected to impact. Fundamental measure of weapon delivery accuracy.
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    CFAR — Constant False Alarm Rate
    A radar detection algorithm that adaptively sets the detection threshold based on local noise/clutter statistics to maintain a constant probability of false alarm.
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    CFAR_LOSS — CFAR Loss
    The reduction in detection performance incurred because a CFAR detector estimates the threshold from finite reference cells.
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    CFD — Computational Fluid Dynamics
    The use of numerical methods to simulate airflow and aerodynamic forces around a vehicle.
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    CFF — Call for Fire
    A request for fire support containing the data needed by the firing unit to deliver fires on a target.
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    CFL — Coordinated Fire Line
    A line beyond which conventional surface fires may be delivered without further coordination with the establishing headquarters.
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    CFMU — Central Flow Management Unit
    The European unit that coordinates air traffic flow and capacity management across the region.
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    CFR — Code of Federal Regulations
    The codification of the general and permanent rules published by U.S. federal executive agencies.
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    CG — Center of Gravity
    Point where an aircraft’s weight effectively acts; governs stability.
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    Chaff
    Bundles of thin metallic strips released from aircraft or ships to create false radar returns. Modern chaff is cut to resonate at specific threat radar frequencies for maximum effect.
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    CHAMP — Counter-electronics High-Power Microwave Advanced Missile Project
    Air-launched cruise missile that delivers directed high-power microwave pulses to disable unshielded electronics (data centres, radars, command nodes) without kinetic destruction. Boeing AGM-158 test platform.
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    Channel Model
    A mathematical description of how a transmitted signal is altered between antenna ports — path loss, multipath, Doppler, Faraday rotation, atmospheric attenuation. AWGN, Rayleigh, Rician, and tapped-delay-line models cover most engineering needs.
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    Charging
    The accumulation of electrical charge on spacecraft surfaces from the surrounding plasma environment. Differential charging between surfaces can lead to electrostatic discharge events, corrupting electronics or destroying components.
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    Chemical Propulsion
    Rocket propulsion using combustion of liquid or solid propellants. Provides high thrust but low specific impulse (250-450 s). Dominant for launch vehicles and large orbital manoeuvres.
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    CHENG — Chief Engineer
    The officer responsible for a ship’s propulsion, electrical and auxiliary engineering plants.
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    Chirp
    A waveform whose instantaneous frequency varies with time — linear (LFM), exponential, hyperbolic. Foundation of pulse-compression radar and SAR, achieving fine range resolution from a long pulse via matched filtering.
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    CI — Counterintelligence
    Activities to identify and counter the intelligence threats posed by foreign services and hostile actors.
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    CIA — Confidentiality, Integrity, Availability
    The three core security objectives that form the foundational triad of information security.
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    Cialdini — Cialdini's Six Principles of Influence
    Robert Cialdini's 1984 framework: reciprocity, commitment/consistency, social proof, authority, liking, scarcity. Updated in 2016 to add unity. The default vocabulary for analysing persuasion in negotiation, marketing, and stakeholder management.
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    CIC — Combat Information Center
    The nerve center of a warship where tactical information from all sensors is collected, processed, displayed, and disseminated. Coordinates weapons, sensors, and communications for combat operations.
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    CIDR — Classless Inter-Domain Routing
    An IP addressing scheme that allocates address blocks with variable-length prefixes.
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    CISA — Cybersecurity and Infrastructure Security Agency
    US agency responsible for protecting critical infrastructure from cyber and physical threats.
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    CIWS — Close-In Weapon System
    An automated, radar-guided gun system for defense against anti-ship missiles and close-in threats. Provides last-ditch point defense using rapid-fire guns or short-range missiles.
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    CJADC2 — Combined Joint All-Domain Command and Control
    Coalition variant of JADC2 incorporating allied national networks and data. Interoperability mandates include Link 16 / Link 22 harmonisation, NATO Federated Mission Networking, and common data models (NIEM, STANAG 4774/4778).
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    CJCS — Chairman of the Joint Chiefs of Staff
    The highest-ranking military officer and principal military advisor to the President and Secretary of Defense.
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    CJTF — Combined Joint Task Force
    A multinational, multi-service task force formed for a specific contingency operation.
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    CL — Class of Supply
    One of the ten categories into which military supplies are divided for management and distribution.
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    Class I-IX Supply
    NATO/US military supply classification: I (rations), II (clothing/equipment), III (POL/fuel), IV (construction), V (ammunition), VI (personal items), VII (major end items), VIII (medical), IX (repair parts).
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    Cleanroom (ISO 14644)
    Controlled environment with specified airborne particulate concentration, used during spacecraft assembly to prevent optical, mechanical, and contamination failures. Common classes: ISO 8 (general AIT), ISO 7 / Class 10,000 (most space hardware), ISO 5 / Class 100 (optical instruments).
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    CLF — Commander, Landing Force
    The officer commanding the landing force embarked for an amphibious operation.
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    CLIII — Class III (Petroleum, Oils, and Lubricants)
    The supply class covering fuels, oils, and lubricants for vehicles and equipment.
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    CLIN — Contract Line Item Number
    A separately identifiable item of supply or service within a contract. Each CLIN has its own description, quantity, unit price, and total price.
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    Clock Recovery
    The receiver task of extracting symbol-timing from an incoming signal so samples can be taken at the correct instants. Implemented by Mueller-Müller, Gardner, or polyphase early-late detectors driving a timing NCO. Critical when the received clock is not separately transmitted.
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    Close Air Support — CAS
    Air operations conducted against hostile targets in close proximity to friendly forces, requiring detailed integration with ground forces. Controlled by a Joint Terminal Attack Controller (JTAC) using 9-line briefs.
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    CLS — Contractor Logistics Support
    A sustainment arrangement where a contractor provides maintenance and supply support for a system.
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    Clutter
    Unwanted radar returns from terrain, sea surface, weather, or other non-target sources. Ground clutter and sea clutter must be suppressed through MTI, Doppler filtering, or CFAR processing.
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    CLV — Class V (Ammunition)
    The supply class covering ammunition, explosives, and related items.
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    CMC — Command Master Chief
    The senior enlisted advisor to the commanding officer on morale, welfare and enlisted matters.
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    CME — Coronal Mass Ejection
    A massive eruption of magnetised plasma from the Sun's corona. Can deliver intense proton flux to Earth orbit within 1-3 days, causing single event effects and elevated radiation dose.
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    CMG — Control Moment Gyroscope
    A momentum exchange device for spacecraft attitude control using a spinning rotor on a gimbal to generate large torques. Higher torque authority than reaction wheels but mechanically more complex.
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    CMMC — Cybersecurity Maturity Model Certification
    US DoD framework requiring defense contractors to demonstrate cybersecurity practices at specified maturity levels (1-3) to protect Controlled Unclassified Information (CUI).
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    CMOS — Complementary Metal-Oxide-Semiconductor
    Dominant semiconductor technology for digital circuits and image sensors. More radiation-tolerant than BJT for TID effects but still susceptible to single event effects (SEU, SEL).
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    CNA — Capability Needs Assessment
    A structured process for identifying, documenting, and prioritizing defense capability gaps and the requirements needed to address them. Feeds directly into acquisition milestone decisions and budget allocation.
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    CNAPP — Cloud Native Application Protection Platform
    Integrated security platform that combines CSPM (cloud posture), CWPP (workload protection), CIEM (entitlements), and IaC scanning into a single control plane. Collapses the sprawl of point products that grew up around Kubernetes + multi-cloud.
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    CND — Computer Network Defense
    Actions taken to protect, monitor, analyze, detect, and respond to unauthorized activity on networks.
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    CNE — Computer Network Exploitation
    Intelligence collection from target information systems through access obtained without authorization. Distinguished from CNA by passive, non-disruptive intent; often a precursor to later offensive operations.
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    CNES — Centre National d'Etudes Spatiales
    France's national space agency and largest ESA contributor. Major programmes include Ariane launch vehicles, SPOT/Pleiades Earth observation, and military space systems.
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    CNO — Chief of Naval Operations
    The senior military officer of the U.S. Navy and a member of the Joint Chiefs of Staff.
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    CNR — Carrier-to-Noise Ratio
    The ratio of carrier power to noise power in a link, determining achievable data rate and error rate.
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    CO — Commanding Officer
    The officer in overall command of a ship, submarine, squadron or unit.
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    CO-IO — Cyberspace Operations for Information Operations
    Use of cyberspace capabilities to create effects in support of information operations objectives.
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    COA — Course of Action
    An option for accomplishing a military mission developed and compared during the planning process. Multiple COAs are wargamed before selection.
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    COCOM — Combatant Command
    The broadest authority a combatant commander exercises over assigned forces, including directive authority for logistics and the ability to organise subordinate commands.
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    Coding Gain
    The reduction in required Eb/No achieved by adding forward error correction coding. Typically 3-10 dB depending on code type and rate.
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    COE — Classical Orbital Elements
    The six Keplerian parameters (a, e, i, RAAN, argument of perigee, true anomaly) that define an orbit and position.
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    COG — Center of Gravity
    The source of power that provides moral or physical strength, freedom of action, or will to act.
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    Cognitive Bias
    A systematic deviation from rational judgement, arising from heuristics that work most of the time but fail in predictable ways. Confirmation bias, anchoring, availability, sunk-cost fallacy. Heuer's ACH technique was developed specifically to counter them in intelligence analysis.
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    COIN — Counterinsurgency
    Military, paramilitary, political, economic, psychological, and civic operations against insurgency. US doctrine in FM 3-24 emphasises population-centric approaches, rule of law, and legitimacy over kinetic action alone.
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    COLA — Collision Avoidance
    Analysis and maneuver planning to prevent spacecraft collisions with tracked debris or other satellites. Typically triggered when conjunction probability exceeds 1:10,000.
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    Cold Gas Thruster
    The simplest propulsion system, expelling stored pressurised gas (typically nitrogen) through a nozzle. Very low Isp (~65 s) but extremely simple and reliable. Common on CubeSats for attitude control.
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    COLREGS — International Regulations for Preventing Collisions at Sea
    The international rules of the road governing navigation to prevent collisions between vessels.
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    Combat Air Patrol — CAP
    Fighter aircraft maintained airborne in a defensive orbit to intercept hostile aircraft or missiles attempting to penetrate an area. Categories include force CAP, barrier CAP, HVAA CAP, and target CAP.
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    COMINT — Communications Intelligence
    Intelligence derived from the interception of communications between people or machines. Reveals adversary intent, command relationships, and operational plans. A subdivision of SIGINT.
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    Commander’s Intent
    A concise expression of the purpose of an operation and the desired military end state. Enables subordinate initiative by giving junior leaders the intent, not just the tasks, so they can adapt to friction on their own authority.
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    Commissioning
    The post-LEOP phase where all spacecraft subsystems and payload instruments are methodically activated, calibrated, and verified against performance specifications before declaring the mission operational.
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    Competitive Dialogue
    A two-stage procurement procedure used in complex contracts where the buyer engages bidders in iterative discussion to refine the technical solution before final tenders. Defined in EU Public Contracts Regulations and UK PPN.
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    Compliance
    Conformance to applicable regulations, standards, contracts, and policies. In aerospace/defence: ITAR/EAR (export), AS9100 (quality), DFARS (cyber), FedRAMP (cloud), and many more. The compliance matrix is a standard contract artifact.
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    Composite Structure
    Structural elements from fibre-reinforced polymer materials (typically carbon fibre/epoxy). Superior stiffness-to-weight and strength-to-weight ratios versus aluminium; standard in spacecraft bus construction.
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    COMSEC — Communications Security
    Measures taken to deny unauthorised access to telecommunications. Includes cryptographic security (CRYPTOSEC), emission security (EMSEC), transmission security (TRANSEC), and physical security of COMSEC materials.
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    Cone of Uncertainty
    A project-management concept describing how the range of possible outcomes narrows as a project progresses from initial concept to execution. Early estimates can be off by a factor of 4; detailed estimates by 10%.
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    Confidential Computing
    Computing paradigm where data stays encrypted even during processing, inside a TEE. Enables multi-party analytics, untrusted-cloud workloads, and protection from privileged insiders without rewriting applications in homomorphic encryption.
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    Configuration Management
    The discipline of baselining and controlling changes to a system's technical description. Covers identification, control, status accounting, and audit. Core systems-engineering process with its own ECSS and MIL-STD standards.
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    Conflict Resolution
    Techniques for de-escalating and resolving disputes between people or groups — interest-based bargaining, BATNA-WATNA framing, third-party mediation, structured dialogue. Thomas-Kilmann mode instrument is the workhorse diagnostic.
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    Conjunction
    A predicted close approach between two resident space objects. Conjunction data messages (CDMs) published by the 18th Space Control Squadron are used to decide whether to manoeuvre an operational satellite.
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    Conjunction Assessment
    The process of predicting close approaches between space objects and evaluating collision probability to support collision avoidance manoeuvre decisions.
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    ConOps — Concept of Operations
    A document describing the system from the user's perspective, including operational scenarios and environmental conditions. Used to uncover requirements formal specs may miss.
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    CONPLAN — Concept Plan
    An operation plan in an abbreviated format that may require expansion into a full OPLAN before execution.
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    CONREP — Connected Replenishment
    The transfer of fuel or cargo between ships connected by rigged lines while underway.
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    Constellation
    A coordinated group of satellites working together to provide continuous or near-continuous coverage. Characterized by number of orbital planes, satellites per plane, and phasing (e.g., Walker delta or star patterns).
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    Constellation Diagram
    A 2D plot of a digital modulation's symbol positions in I/Q space. The spacing between points determines noise immunity; the number of points determines bit-per-symbol efficiency.
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    Diagram
    Contested Environment
    An operational environment where adversary action actively degrades friendly capabilities — jamming, kinetic fires, cyber effects, or denial of space and cyber commons. Drives design for graceful degradation and deception resistance.
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    Contested PNT
    PNT operations in environments where adversaries actively jam or spoof GNSS. Drives demand for A-PNT (alternative PNT) sources — chip-scale atomic clocks, vision-inertial nav, signals of opportunity, celestial, terrain-relative.
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    Contract Types
    The major categories of acquisition contract: firm-fixed-price (FFP), cost-plus (CPFF, CPIF, CPAF), time-and-materials (T&M), IDIQ, and BOA. Each shifts risk between buyer and seller differently and is matched to programme uncertainty.
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    Convergence Zone
    An annular region at 30-60 km intervals from a sonar source where sound refracted through the deep sound channel converges, enabling long-range passive acoustic detection.
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    Coordinate Systems
    The reference frames used to express positions and motions: ECI (inertial), ECEF (Earth-fixed), LVLH (local-vertical local-horizontal), body, topocentric. Each problem chooses the frame that simplifies the equations of motion.
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    Coordinate Transform
    The mathematical operation mapping a vector from one reference frame to another via rotation matrices, quaternions, or Euler angles. Foundation of every GNC stack — sensors live in body frame, dynamics in inertial, commands in operator frame.
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    COP — Common Operating Picture
    A shared, real-time display of the operational environment across all components of a joint force. Enables unified situational awareness and coordinated decision-making.
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    Copernicus Sentinel
    ESA / EU EO programme spanning Sentinel-1 (C-band SAR), -2 (multispectral optical), -3 (ocean / land), -4/-5 (atmospheric), -6 (altimetry). Open free data; backbone of European EO.
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    Corps
    A military formation of 20,000–100,000+ personnel composed of multiple divisions plus corps-level assets (aviation, artillery, engineers). The primary warfighting echelon in large-scale combat operations.
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    Cost Estimation
    The disciplined forecast of programme cost — analogy, parametric (CER-based), engineering build-up, expert judgement. JCL (joint cost-and-schedule) Monte Carlo runs in modern major-acquisition reviews. AACE Class 1–5 estimate-classes set fidelity expectations.
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    Cost-per-Gbps
    Capacity-economics metric for satellite comms — total programme cost divided by delivered throughput. Key for comparing GEO HTS, MEO, and LEO constellations as they scale.
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    COTS — Commercial Off-The-Shelf
    Components or systems available commercially rather than custom-designed. CubeSats and small satellites frequently use COTS electronics to reduce cost, though radiation tolerance must be evaluated.
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    Counter-Battery
    The tactical mission of locating and engaging enemy indirect-fire assets. Counter-battery radars detect the projectile trajectory and backtrack to the source in seconds, enabling rapid return fire.
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    Counter-IED — C-IED
    The coordinated set of activities to defeat the IED threat, including attack the network, defeat the device, and train the force. Emphasises disrupting IED supply chains and bomb-maker cells ahead of the emplaced device.
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    Counter-UAS — Counter-Unmanned Aircraft Systems
    Systems and tactics defeating hostile drones — kinetic (gun, missile, net), directed-energy (laser, HPM), RF jamming, GPS spoofing, cyber takeover. The fastest-growing defence segment post-2020 thanks to Group 1–2 drone proliferation.
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    Countermeasures
    Active or passive measures taken to defeat an adversary capability — chaff and flares against IR/RF seekers, jammers against datalinks, encryption against eavesdropping, deception against ISR. Always paired with counter-countermeasures (CCM) in EW lexicon.
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    Counterspace
    Military operations designed to achieve space superiority by negating adversary space capabilities. Includes kinetic ASAT, directed energy, electronic warfare (jamming/spoofing), and cyber attacks on ground segments.
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    CP — Command Post
    A headquarters element where a commander and staff conduct operations.
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    CPA — Closest Point of Approach
    The minimum predicted distance between own ship and another contact along their tracks.
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    CPAF — Cost-Plus-Award-Fee
    A cost-reimbursement contract where the contractor receives reimbursement for allowable costs plus a base fee and an award fee determined by subjective evaluation of contractor performance against stated criteria.
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    CPCE — Command Post Computing Environment
    The Army’s integrated mission-command software environment for planning and executing operations at command posts.
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    CPD — Capability Production Document
    A JCIDS document that addresses production attributes specific to a single increment of an evolutionary acquisition program, defining threshold and objective values for key performance parameters.
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    CPDLC — Controller-Pilot Data Link Communications
    A datalink system allowing controllers and pilots to exchange text messages instead of voice for routine clearances.
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    CPFF — Cost Plus Fixed Fee
    A contract type where the contractor is reimbursed all allowable costs plus a fixed fee that does not vary with actual cost performance.
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    CPI — Cost Performance Index
    An Earned Value Management metric: Earned Value ÷ Actual Cost. A value below 1.0 indicates the project is over budget; above 1.0 indicates under budget.
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    CPIF — Cost Plus Incentive Fee
    A contract type where the contractor is reimbursed allowable costs plus an incentive fee adjusted by a share formula. Shares cost risk between government and contractor.
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    CPM — Continuous-Phase Modulation
    A class of modulations that keep the carrier phase continuous to improve spectral efficiency.
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    CPOF — Command Post of the Future
    A collaborative Army command-and-control system providing a shared operational picture and planning tools.
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    CPR — Cardiopulmonary Resuscitation
    An emergency procedure of chest compressions and ventilation to maintain circulation during cardiac arrest.
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    CQI — Channel Quality Indicator
    A feedback value reporting downlink channel quality to guide modulation and coding choice.
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    Cr — Reflectivity Coefficient
    Solar radiation pressure coefficient. 1.0 = full absorption, 2.0 = full specular reflection.
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    CRAND — Cosmic Ray Albedo Neutron Decay
    The primary source mechanism for the inner Van Allen belt protons. Cosmic rays hitting the atmosphere produce neutrons; some escape upward and decay into protons that become trapped by Earth's magnetic field.
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    CRC — Cyclic Redundancy Check
    An error-detecting code that appends a checksum derived from polynomial division.
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    Crisis Comms — Crisis Communications
    The discipline of managing communications during incidents — internal alerting, external messaging, stakeholder coordination. Drives press-officer training, message templates, and the dual goals of accuracy and timeliness when neither is fully achievable.
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    Critical Infrastructure Interdependency
    The mutual reliance between critical infrastructure sectors (energy, transport, finance, communications, defense) where failure in one sector cascades to others. Space services are a cross-cutting enabler underpinning multiple sectors simultaneously.
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    Critical Path
    The longest sequence of dependent tasks in a project schedule, determining the minimum possible duration. A task on the critical path has zero slack — any delay slips the whole project.
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    CRLB — Cramer-Rao Lower Bound
    The theoretical minimum variance of an unbiased estimator, used to bound sensor measurement accuracy.
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    CRM — Crew Resource Management
    Training and practices that improve teamwork, communication, and decision-making among flight crew.
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    Cross-Eye Jamming
    A deception jamming technique using two spatially-separated sources with specific phase and amplitude relationships to create a false angular return, drawing a monopulse radar's track away from the platform.
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    CRPA — Controlled Reception Pattern Antenna
    An anti-jam GNSS antenna system that electronically steers nulls toward jammer directions while maintaining reception from GNSS satellites.
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    Cryptography
    The mathematical study of techniques for securing communications and data — confidentiality (encryption), integrity (MACs, hashes), authentication (signatures), and non-repudiation. Foundational to virtually every modern security control.
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    CSF — Cybersecurity Framework
    NIST framework organizing cybersecurity activities into functions such as identify, protect, and respond.
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    CSG — Carrier Strike Group
    A naval formation centered on an aircraft carrier with escorting combatants and aircraft.
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    CSM — Command Sergeant Major
    The senior noncommissioned officer of a battalion or higher unit, advising the commander on enlisted matters.
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    CSMA — Carrier Sense Multiple Access
    A contention protocol where nodes listen for a clear channel before transmitting.
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    CSMA/CA — Carrier Sense Multiple Access with Collision Avoidance
    A CSMA variant used in Wi-Fi that avoids collisions via backoff and channel reservation.
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    CSMA/CD — Carrier Sense Multiple Access with Collision Detection
    A CSMA variant used in classic Ethernet that detects and backs off from collisions.
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    CSpOC — Combined Space Operations Center
    The US-led center providing space surveillance, cataloging, and conjunction warnings.
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    CSRF — Cross-Site Request Forgery
    Attack that tricks an authenticated user browser into submitting an unwanted request to a web app.
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    CSS — Coarse Sun Sensor
    A simple photodiode-based sensor giving an approximate Sun direction for safe-mode and coarse pointing.
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    CSSB — Combat Sustainment Support Battalion
    A battalion that provides sustainment support such as supply, transportation, and field services to units.
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    CTA — Control Area
    Controlled airspace extending upward from a specified height above the earth to protect en-route and terminal traffic.
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    CTE — Coefficient of Thermal Expansion
    A material property describing dimensional change per degree of temperature change (ppm/K). Mismatch between bonded materials causes thermal stress during the rapid temperature cycling of LEO orbits.
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    CTEM — Continuous Threat Exposure Management
    Gartner-coined program model that treats exposure reduction as a continuous loop (scope → discover → prioritise → validate → mobilise) rather than periodic vulnerability scans. Replaces point-in-time assessments with adversary-informed, business-aligned remediation.
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    CTF — Commander, Task Force
    The officer commanding a task force, the largest subdivision of a numbered fleet.
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    CTG — Commander, Task Group
    The officer commanding a task group, a subdivision of a task force.
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    CTI — Cyber Threat Intelligence
    Knowledge about adversary capabilities and intent in cyberspace.
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    CTOT — Calculated Take-Off Time
    A departure time slot assigned by flow management that an aircraft must adhere to for takeoff.
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    CTR — Control Zone
    Controlled airspace extending upward from the surface of the earth around an aerodrome to a specified upper limit.
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    CTU — Commander, Task Unit
    The officer commanding a task unit, a subdivision of a task group.
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    CubeSat
    A standardized small satellite form factor based on 10x10x10 cm units (1U). Common sizes range from 1U to 12U. Standardized deployers (e.g., P-POD) enable rideshare launches.
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    CubeSat-U — CubeSat Unit
    A standardized 10 cm cube form factor for small satellites, combined in multiples to size a spacecraft.
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    CULT — Combat Uploaded
    The state in which a platform is loaded with a full combat load of ammunition and supplies.
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    Cultural Transformation
    A planned change in shared organisational values, behaviours, and practices. Distinct from organisational change (structure, process). Slow (3–7 years), often led from the top but sustained at team level. Common driver: M&A, safety incident, or new strategic direction.
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    CV — Aircraft Carrier
    A conventionally powered aircraft carrier operating fixed- and rotary-wing aircraft at sea.
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    CVE — Common Vulnerabilities and Exposures
    A standardised identifier system for publicly known security vulnerabilities, maintained by MITRE. Each entry (CVE-YYYY-NNNNN) has a canonical description so defenders, vendors, and scanners can reference the same vulnerability unambiguously.
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    CVN — Nuclear Aircraft Carrier
    Nuclear-powered aircraft carrier. Gerald R. Ford-class (CVN-78) features EMALS catapults. Carries 75+ aircraft and serves as the centrepiece of carrier strike groups.
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    CVR — Cockpit Voice Recorder
    A crash-protected device that records cockpit audio and radio communications for accident investigation.
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    CVSS — Common Vulnerability Scoring System
    An open framework for rating vulnerability severity on a 0–10 scale across base (exploitability + impact), temporal, and environmental metrics. CVSS v3.1 is the current standard; v4.0 adds threat context and subsequent-system impact.
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    CVW — Carrier Air Wing
    The organization of aircraft squadrons embarked aboard an aircraft carrier.
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    CW — Continuous Wave
    Unmodulated or continuously radiating signal, characteristic of certain radars and communication systems.
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    CWA — Chemical Warfare Agent
    A chemical substance intended to kill, injure, or incapacitate through its toxic properties in warfare.
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    CWC — Composite Warfare Commander
    The command concept delegating warfare authority to subordinate warfare commanders under the OTC.
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    CYBER
    Generic shorthand for the cyberspace domain in joint-domain frameworks (air, land, sea, space, cyber). Used as a tag for cyber operations, cyber defence, and cyber intelligence content.
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    Cyber Kill Chain
    Seven-stage model of cyberattack phases: Reconnaissance, Weaponization, Delivery, Exploitation, Installation, Command & Control, Actions on Objectives. Used for offensive planning and defensive detection.
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    Cybersecurity
    The practice of protecting systems, networks, and data from digital attack. Broad umbrella covering network security, application security, identity, endpoint, governance, incident response, and threat intelligence. Synonymous with information security in most contexts.
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    CZ — Convergence Zone
    An annular region where sound refracts back toward the surface, enabling long-range sonar detection.
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