- T&M — Time and Materials
- A contract type providing payment based on actual labour hours at fixed rates plus materials cost. Used when scope cannot be precisely defined upfront.
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- TA — True Anomaly
- Angular position of an orbiting body measured from perigee at the focus.
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- TAA — Tactical Assembly Area
- A secure area where a unit prepares for future operations and conducts final preparations before movement.
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- TACAN — Tactical Air Navigation
- A military navigation aid providing range and bearing to a ground or shipborne beacon, operating in the 962–1213 MHz band. Combined with civilian VOR as VORTAC. More accurate than VOR/DME but requires military-specification airborne equipment.
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- TACON — Tactical Control
- The detailed direction and control of movements or manoeuvres within an operational area necessary to accomplish assigned missions or tasks.
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- TADIL — Tactical Digital Information Link
- US military designation for standardised tactical data link protocols. TADIL-A is Link 11, TADIL-B is Link 11B, TADIL-C is Link 4A, and TADIL-J is Link 16.
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- TAF — Terminal Aerodrome Forecast
- A coded forecast of expected weather conditions at an airport over a defined future period.
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- TAI — Target Area of Interest
- An area where the commander can engage high-payoff targets to disrupt or defeat the enemy.
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- TAK — Tactical Assault Kit
- A geospatial situational-awareness application suite used for mapping, tracking, and coordination on tactical devices.
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- Targeted Area of Interest — TAI
- A geographic area where a commander can acquire and engage high-payoff targets to create the effects desired in the operation. The kinetic counterpart to NAI — where ISR collection turns into shooter tasking.
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- Targeting Pod
- An externally-mounted aircraft sensor pod combining high-resolution electro-optical and infrared cameras with a laser rangefinder/designator. Enables day/night precision targeting. Examples: Litening, Sniper, ATFLIR.
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- TAS — True Airspeed
- Aircraft speed relative to the air mass, corrected for density.
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- TASMO — Tactical Air Support of Maritime Operations
- Air support provided to naval forces for anti-surface, ASW and surveillance missions.
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- TAT — Turnaround Time
- The elapsed time to service and return an item or platform to operational availability.
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- TAV — Total Asset Visibility
- The capability to track the location, movement, and status of assets throughout the supply chain.
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- TAWS — Terrain Awareness and Warning System
- A system that alerts pilots to potential controlled flight into terrain using a terrain database and aircraft position.
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- TAXII — Trusted Automated Exchange of Intelligence Information
- Protocol for exchanging cyber threat intelligence over HTTPS, commonly paired with STIX.
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- TBI — Traumatic Brain Injury
- Brain dysfunction caused by an external force such as a blow, blast, or penetrating injury to the head.
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- TBM — Theater Ballistic Missile
- Ballistic missile with range between 300-3500 km. Includes SRBM, MRBM, and IRBM categories. Primary threat addressed by THAAD and Patriot systems.
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- TBO — Time Between Overhaul
- The manufacturer-specified operating interval between scheduled major overhauls of an item.
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- TBS — The Basic School
- USMC officer school at Marine Corps Base Quantico, VA. Every newly commissioned Marine officer attends TBS. B-coded lessons (B3L4038 etc.) come from the TBS curriculum.
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- Diagram
- TCA — Time of Closest Approach
- The UTC instant at which two tracked space objects reach their minimum predicted separation. CDMs are issued 7 days, 72 hr, and 24 hr before TCA for high-interest conjunctions.
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- TCAP — Traffic Collision Avoidance Performance
- A metric describing how well a collision avoidance system performs in resolving traffic conflicts.
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- TCAS — Traffic Collision Avoidance System
- Onboard system that warns of and resolves collision threats.
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- TCCC — Tactical Combat Casualty Care
- The evidence-based guidelines for managing trauma casualties in a combat environment.
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- TCDL — Tactical Common Data Link
- A lighter, lower-power variant of the Common Data Link for tactical ISR platforms.
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- TCP — Traffic Control Point
- A manned post established to regulate, control, or block movement along a route.
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- TCPA — Time to Closest Point of Approach
- The predicted time until own ship reaches the closest point of approach to a contact.
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- TCPED — Tasking, Collection, Processing, Exploitation, and Dissemination
- The end-to-end intelligence cycle from directing collection assets to delivering finished intelligence.
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- TCPI
- To-Complete Performance Index — the cost efficiency the remaining work must hit to land on budget. Above ~1.1 is hard to recover.
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- TCS — Thermal Control System
- Maintains spacecraft components within their thermal limits.
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- TDA — Table of Distribution and Allowances
- A document prescribing the organization, personnel, and equipment for a fixed support or institutional unit.
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- TDL — Tactical Data Link
- A standardised communication link used to transmit formatted tactical data between military platforms in near real-time. Enables a shared operational picture across air, surface, ground, and space assets.
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- TDM — Time Division Multiplexing
- Combining multiple signals on one channel by interleaving them into repeating time slots.
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- TDMA — Time Division Multiple Access
- A channel access method dividing a shared radio channel into discrete time slots. Each participant transmits only in assigned slots. Used by Link 16 with 128 time slots per 12-second epoch in a recurring frame structure.
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- TDOA — Time Difference of Arrival
- A geolocation technique that determines emitter location by measuring the difference in signal arrival times at two or more receivers, producing hyperbolic lines of position.
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- TDP — Technical Data Package
- The set of drawings, specifications, and data needed to manufacture and support an item.
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- TDY — Temporary Duty
- Duty performed away from a member’s permanent station for a limited period.
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- TECHINT — Technical Intelligence
- Intelligence derived from collection, processing, analysis, and exploitation of foreign equipment and materiel. Used to assess adversary capabilities, vulnerabilities, and development trajectories.
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- TEE — Trusted Execution Environment
- A hardware-isolated execution context (Intel SGX/TDX, AMD SEV-SNP, ARM TrustZone, Apple Secure Enclave) that protects code + data from the host OS, hypervisor, and physical attackers. Foundation for confidential computing.
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- Diagram
- TEI — Trans-Earth Injection
- The maneuver placing a spacecraft onto a return trajectory from another body back toward Earth.
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- TEL — Transporter Erector Launcher
- A mobile vehicle that transports, erects, and launches ballistic or cruise missiles. TEL mobility makes pre-emptive strike difficult and complicates missile defense.
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- Telemetry
- Data transmitted from a spacecraft to ground describing the state of onboard subsystems (temperatures, voltages, attitudes, etc.). Part of the TT&C function.
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- TELINT — Telemetry Intelligence
- Intelligence derived from intercepting and analyzing telemetry transmitted by missiles, rockets, or vehicles under test.
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- TEMPEST — Compromising Emanations Standard
- Standards limiting unintended information-bearing emanations.
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- Terminal Guidance
- The final phase of missile guidance as it closes on the target, typically using an active seeker for autonomous homing. Complements midcourse guidance from launch-platform sensors or data-link updates.
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- Terminal Phase
- The final atmospheric descent of a ballistic missile onto the target area. Shortest engagement window (under 60 s) but closest to defended assets — the domain of PAC-3, THAAD, and Aegis SM-6 interceptors.
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- Terrain Masking
- Using ridgelines, valleys, and urban clutter to deny line-of-sight to enemy radar or comms. The RF analogue of physical cover — exploited by NOE helicopter flight, SOF infiltration, and ground formations under EMS pressure.
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- Test & Evaluation
- The disciplined process of subjecting a system to controlled conditions to characterise performance, suitability, and effectiveness. DT&E (developmental T&E) precedes OT&E (operational T&E) before production / fielding decisions.
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- Tethered UAS
- Unmanned aircraft physically tethered to a ground unit for power and / or data. Enables persistent stare (no battery limit) and a hardened, low-RF-signature comms channel. Common for force-protection ISR and event coverage.
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- TETRA — Terrestrial Trunked Radio
- A digital professional mobile radio standard for public-safety and emergency services.
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- TEWT — Tactical Exercise Without Troops
- A field-based tactical training exercise conducted on actual terrain using maps and discussion but without deploying forces. Develops tactical decision-making through terrain appreciation and plan development on the ground.
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- THAAD — Terminal High-Altitude Area Defense
- US hit-to-kill BMD system intercepting short and medium-range ballistic missiles in terminal phase at 40-150 km altitude. Uses AN/TPY-2 X-band radar. Deployed in South Korea, UAE, Guam.
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- Thermal Budget
- A controlled record of allowable temperature ranges per unit and integrated heat-flow analysis, accounting for hot / cold operational cases. Drives radiator area, heater sizing, MLI design, and conduction paths.
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- Diagram
- Thermal Cycling
- Repeated temperature swings between sunlit/eclipse orbit portions. Major driver of mechanical fatigue and solder joint failure; tested during TVAC qualification.
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- Thermocline
- A layer of water where temperature changes rapidly with depth, creating a sound velocity gradient that refracts acoustic energy. Major factor in sonar detection performance.
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- Thomas-Kilmann
- A conflict-resolution model mapping five approaches on assertiveness × cooperation axes: competing, collaborating, compromising, avoiding, accommodating. Used in negotiation and team-dynamics training.
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- Threat Hunting
- The proactive search for adversaries already inside a network, going beyond signature-based alerting. Hypothesis-driven (e.g. "if APT-X is here, we'd see X behaviour"), powered by EDR telemetry, SIEM correlation, and ATT&CK techniques.
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- Threat Modeling
- A structured practice of enumerating a system's assets, entry points, trust boundaries, and likely adversaries, then designing mitigations. Frameworks: STRIDE (MS), PASTA, LINDDUN (privacy), attack trees. Cheapest when done before the code is written.
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- Diagram
- Throttleability
- Engine capacity to vary thrust during flight. Solid motors are essentially fixed; most liquid engines throttle 60–110% of nominal; aerospike and plug-nozzle designs target 10–100%. Essential for precision landings (F9 Merlin, BE-7).
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- Thruster
- A propulsive device producing thrust by ejecting reaction mass — chemical (hydrazine, bipropellant, cold-gas), electric (Hall, ion, PPT), or solid. Sized by mission Δv, response time, plume contamination, and lifetime impulse requirements.
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- THSS — Time-Hopping Spread Spectrum
- A spread-spectrum technique that transmits pulses in pseudorandomly chosen time slots.
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- THU — Thruster Unit
- An individual propulsion actuator producing thrust for attitude control or orbit maneuvers.
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- TIC — Troops in Contact
- A report indicating friendly forces are actively engaged in combat. Triggers priority CAS, fires, QRF, and MEDEVAC asset allocation.
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- TID — Total Ionizing Dose
- Cumulative radiation energy absorbed by electronic components over mission lifetime, measured in krad(Si). Drives component selection, shielding design, and radiation hardness assurance testing.
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- TIM — Toxic Industrial Material
- A toxic industrial chemical, biological, or radiological material posing a hazard when released.
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- Time-Triggered Architecture
- System architecture in which all activity is initiated by the progression of a globally synchronised time, rather than by events. Provides bounded latency and composability — a node's timing is unaffected by other nodes' load. Used in TTP, TTEthernet, and some safety-critical buses.
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- Diagram
- TIP — Threat Intelligence Platform
- System that aggregates, correlates, and operationalizes cyber threat intelligence feeds.
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- TIR — Thermal Infrared
- Electromagnetic radiation in the 8-14 micrometre atmospheric window used for surface temperature measurement, thermal mapping, and fire detection from space.
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- TL — Transmission Loss
- The reduction in acoustic signal intensity as sound propagates from source to receiver through the water.
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- TLAM — Tomahawk Land Attack Missile
- A long-range, all-weather subsonic cruise missile launched from ships and submarines against land targets.
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- TLE — Two-Line Element
- A standardized format for distributing orbital element data, maintained by the US Space Surveillance Network. Contains mean Keplerian elements at a specific epoch for SGP4 propagation.
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- TLI — Trans-Lunar Injection
- The maneuver that places a spacecraft onto a trajectory from Earth orbit toward the Moon.
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- TLP — Troop Leading Procedures
- A dynamic process used by small-unit leaders to analyze a mission, develop a plan, and prepare for an operation.
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- TLS — Transport Layer Security
- Cryptographic protocol that provides confidentiality and integrity for data in transit over networks.
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- TMA — Terminal Control Area
- Controlled airspace established around one or more major airports to protect arriving and departing traffic.
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- TMS — Transportation Management System
- Software that plans, executes, and optimizes the movement of freight across carriers and modes.
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- TOA — Time of Arrival
- The absolute time at which a signal reaches a receiver, used for ranging and localization.
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- TOA_RAD — Top-of-Atmosphere Radiance
- The radiance measured at the top of the atmosphere before atmospheric correction to surface reflectance.
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- TOC — Tactical Operations Center
- A command post where a unit’s staff coordinates and controls current operations.
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- TODA — Take-Off Distance Available
- The take-off run available plus the length of any clearway provided at the end of the runway.
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- TOGA — Take-Off/Go-Around
- A thrust setting and mode used to apply maximum power for takeoff or to abandon an approach and climb away.
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- Tomahawk
- US long-range subsonic cruise missile (BGM-109) from ships/submarines. GPS/INS guided, ~1,600 km range. Block V adds maritime moving-target capability.
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- TORA — Take-Off Run Available
- The length of runway declared available and suitable for the ground run of an aircraft taking off.
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- TOT — Time on Target
- The time at which munitions from multiple firing units are set to impact simultaneously on a target.
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- TPM — Technical Performance Measure
- Tracked engineering parameter against its target.
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- TPS — Thermal Protection System
- Materials and structures that protect spacecraft or re-entry vehicles from aerothermal heating. Includes ablative heat shields (Apollo, Orion), reinforced carbon-carbon (Shuttle leading edges), and tiled silica (Shuttle belly).
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- Traceability
- The ability to track relationships between artifacts — requirements to design to test, code to commit, change to ticket. Bidirectional traceability is mandated for safety-critical software (DO-178C, ISO 26262) and for accreditation in regulated industries.
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- Traceability Matrix
- Tabular mapping showing each requirement's satisfaction by design elements and verification by test. Forward traces answer "where is this implemented?"; backward traces answer "why does this test exist?". Mandatory deliverable for DO-178C, DO-254, ISO 26262.
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- Track Initiation
- The radar data-processing step of promoting a sequence of detections into a confirmed track. Requires correlating detections across scans using motion prediction and gating.
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- Track-While-Scan — TWS
- A radar mode that maintains tracks on multiple targets while continuing to scan for new ones. Uses digital tracking filters to interpolate between scan updates. Standard mode for modern AESA fighter and early-warning radars.
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- DiagramTry it: Defense Fundamentals GuideTry it: Multiint Fusion GuideTry it: Ew Guide
- Tracking
- The maintenance of a continuous estimate of a target's state (position, velocity) from successive sensor measurements. Implemented by Kalman filters (linear), EKF/UKF (nonlinear), or particle filters (multimodal). Critical for both engagement and SSA.
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- TRACON — Terminal Radar Approach Control
- A US facility that uses radar to sequence and separate aircraft arriving at and departing from busy terminal areas.
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- Trade Study
- A structured evaluation of alternative design or programme options against weighted criteria. Produces a quantitative recommendation and documents the reasoning for the decision trail.
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- TRANSEC — Transmission Security
- Component of COMSEC that protects transmissions from interception and exploitation by means other than cryptanalysis. Includes frequency hopping, spread spectrum, burst transmission, and low probability of intercept techniques.
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- Transfer Orbit
- An intermediate orbit used to move a satellite from one orbit to another, such as a Hohmann transfer, bi-elliptic transfer, or low-thrust spiral.
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- Trilateration
- Position determination from three or more range measurements to known reference points — the geometric basis of GPS. Distinguishes from triangulation, which uses angles, not distances. Adds a fourth satellite to solve for receiver clock bias.
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- TRL — Technology Readiness Level
- A 1-9 scale measuring technology maturity from basic research (TRL 1) through mission-proven operation (TRL 9). Standard metric for technology risk assessment.
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- TRM — Transmit/Receive Module
- The building block of an active array containing amplifiers and phase control for one or more antenna elements.
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- TRP — Target Reference Point
- Easily identifiable terrain feature used to coordinate and shift direct and indirect fires. Always numbered and graphically depicted on operational overlays.
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- TRR — Test Readiness Review
- Mandatory gate review confirming that test facilities, procedures, hardware, GSE, and personnel are ready before test execution begins. Verifies all prerequisites and safety requirements are met.
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- True Anomaly
- The angle from the periapsis to the satellite's current position, measured in the direction of motion. Distinct from mean anomaly (uniform time-based) and eccentric anomaly (geometric auxiliary). Converted via Kepler's equation.
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- TS — Target Strength
- A measure of the acoustic energy an underwater target reflects back toward a sonar, analogous to radar cross section.
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- Tsiolkovsky Rocket Equation
- Δv = ve · ln(m0 / mf). The fundamental relationship between propellant mass fraction and achievable velocity change. Konstantin Tsiolkovsky derived it in 1903 and exposed why staging is mandatory for orbital flight.
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- TST — Time-Sensitive Target
- A high-value fleeting target requiring engagement within a narrow time window before it relocates or becomes unavailable. TSTs compress the kill chain and often require pre-delegated engagement authority.
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- TT&C — Telemetry, Tracking, and Command
- The communication functions between ground and spacecraft: telemetry (satellite-to-ground status), tracking (orbit determination via ranging/Doppler), and command (ground-to-satellite instructions).
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- TTEthernet — Time-Triggered Ethernet
- SAE AS6802 deterministic Ethernet standard combining time-triggered, rate-constrained, and best-effort traffic on the same wire. Used in Orion crew vehicle and several launch-vehicle avionics for synchronised distributed control.
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- TTL — Time To Live
- A packet field limiting its lifetime by decrementing at each hop to prevent loops.
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- TTP — Tactics, Techniques, and Procedures
- Detailed methods used to accomplish military missions. TTPs translate doctrine into specific actions — how to plan, coordinate, and execute operations at the tactical level. Tactics describe WHAT to do, Techniques describe HOW, and Procedures define exact mandatory steps.
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- TTP Validation
- The formal process of verifying a TTP is doctrinally sound, empirically tested, and operationally feasible. Three methods: SME Consensus (expert panel review), Simulation (Monte Carlo runs with statistical confidence), and Role-Play Analysis (structured wargaming with adjudicated outcomes).
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- TTPs — Tactics, Techniques, and Procedures
- Established methods for accomplishing tasks at multiple echelons. Tactics = how to fight at the operational level; Techniques = how to apply tactics; Procedures = the detailed how-to steps.
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- Diagram
- Tundra Orbit
- A highly elliptical geosynchronous orbit with 63.4-degree inclination and 24-hour period. Extended dwell time over high-latitude regions with a single satellite.
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- TVAC — Thermal Vacuum
- Environmental test simulating the space vacuum and thermal environment. Uses vacuum chambers with IR lamps and liquid nitrogen shrouds to replicate solar flux and eclipse conditions while running functional tests at temperature plateaus.
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- TVC — Thrust Vector Control
- Steering a rocket by gimballing the engine or nozzle.
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- Two-Body Problem
- The simplified model of orbital motion where only the gravitational attraction between two point masses is considered. Produces conic-section trajectories (ellipse, parabola, hyperbola) governed by Kepler's three laws.
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- TWR — Thrust-to-Weight Ratio
- The ratio of a vehicle’s thrust to its weight, indicating its ability to accelerate or climb.
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- TWT — Traveling Wave Tube
- The vacuum electron device at the heart of a TWTA used for microwave amplification in transponders.
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- TWTA — Traveling Wave Tube Amplifier
- A high-power vacuum-tube amplifier used in satellite transponders to boost downlink signals.
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- TWTA-eff — End-of-Life Power Margin
- The reserve between available and required power at end of life after array and battery degradation.
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- TYCOM — Type Commander
- The commander responsible for manning, training and equipping a specific type of naval force.
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- Type 1 — Type 1 Cryptography
- NSA-certified cryptography authorised for protecting classified US government information. Uses approved algorithms (SAVILLE, FIREFLY, BATON, MEDLEY) with strict key management and implementation requirements.
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- Type 1 Crypto
- NSA classification for cryptographic equipment certified to protect classified national security information up to TOP SECRET//SCI. Algorithms, keys, and key-management infrastructure are themselves classified. Examples: KG-175D Taclane, KIV-7M, AIM modules.
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- Type 1 Encryption
- NSA-approved cryptographic algorithm or equipment for protecting classified US government information. Includes Suite A algorithms and devices like KG-175 TACLANE and KGV-72 for tactical data links.
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