| T |
| T | Ton(s) |
| T/A | Table of Authorization |
| T/O | Task Organization |
| TA | Table of Allowance(s)/Authorization |
| TA | Territorial Artillery |
| TAC | Tactical |
| TAC | Tactical Air Command |
| TAC/AFSC | Tactical Air Command /Air Force Systems Command |
| TACAIR | Tactical Air |
| TACAN | Tactical Air Navigation - an active electronic navigational system which locates the aircraft with respect to another installation. |
| TACC | Tactical Air Control/Coordination Center |
| TACP | Tactical Air Control Party |
| TACS | Tactical Air Control System |
| TAD | Temporary Additional Duty |
| TADC | Tactical Air Direction Center |
| TAOR | Tactical Area of Responsibility |
| TAOR/I | Tactical Area of Responsibility or Interest |
| TAR | Tactical Air Request |
| TARCAP | Target Combat Air Patrol - aircraft assigned the airto-air defense role in the target area. |
| TAS | True Air Speed - in knots. |
| TASE | Tactical Air Support Element |
| TASS | Tactical Air Support Squadron |
| TAT | Technical Assistance Team |
| TC | Training Center |
| TC | Transportation Corps |
| TCA | Track Crossing Angle - the angle between flight paths measured from the tail of the reference aircraft. |
| TCC | Telecommunications Center |
| TCG | Technical Control Group |
| TCMD | Transportation Control & Movement Document |
| TCN | Third Country National(s) |
| TCP | Traffic Control Point |
| TCTO | Time Compliance Technical Order |
| TCW | Troop Carrier Wing |
| TD | Table of Distribution |
| TDA | Table of Distribution and Allowance |
| TDC | Target Detection Center |
| TDY | Temporary Duty |
| TE | Table of Equipment |
| TE | Tactical Emergency |
| Tech Rep | Technical Representative |
| TEES | Territorial Forces Evaluation System |
| Tet/TET | Vietnamese Lunar New Year Holiday |
| TF | Task Force |
| TF | Territorial Force(s) |
| TF-76 | Task Force 76 (United States Navy) |
| TFA | Task Force ALPHA |
| TFARS | Territorial Forces Activity Reporting System |
| TFCW | Task Force CLEARWATER |
| TFES | Territorial Force Evaluation System |
| TFG | Tactical Fighter Group |
| TFID | Territorial Forces Inspections Division |
| TFS | Tactical Fighter Squadron |
| TFW | Tactical Fighter Wing |
| TG | Task Group |
| TG | Transportation Group |
| Tgt | Target |
| THAI AM | Thai American |
| Thud Ridge | Nickname given to a prominent geographical feature in North Vietnam. It is a ridge running in a general NW-SE direction from 21°40'N/105°25E to 21020'N/105148'E. |
| TIC | Troops in Contact |
| TIGER OPS | Flying Tiger (Airlines) Operations Office |
| TIGHT JAW | Vietnamese Controlled Unattended Ground Sensor Program. |
| TIRS | Terrorist Incident Reporting System |
| TL | Province Road |
| TL | Total |
| Tm | Team |
| TM | Technical/Training Manual |
| TMA | Traffic/Transportation Management Agency |
| TMDE | Test, Measurement and Diagnostic Equipment |
| TME | Test and Measurement Equipment |
| TMO | Transportation Movement Office(r) |
| TMS | Training Management Section /System |
| TNG | Training |
| TNT | Trinitrotoluene (Explosive) |
| TO | Technical Order(s) |
| TO&E | Table of Organization and Equipment |
| TOC | Tactical Operations Center |
| TOE | Table of Organisation and Equipment |
| TOMMS | Training Objective and Measurement Management System |
| TOP | Training, Organisation and Personnel Advisory Board |
| TOT | Time Over (on) Target |
| TOW | Tube Launched, Optically Tracked, Wire Guided Missile |
| TRAC | Target Research and Analysis Center |
| TRAC | Third Regional Assistance Command |
| TRACK (various colors) | Code names for specific aerial refueling tracks. |
| TRANS | Transportation |
| TRAPAC | Training Pacific |
| TRIM | Trail Road Interdiction Multi-sensor |
| TRIM | Training Relations Instruction Mission |
| TROJAN HORSE | Code name of a U-2 air reconnaissance program. |
| TROPO | Tropospheric-Scatter |
| Trp/TRP | Troop |
| TRS | Tactical Reconnaissance Squadron |
| TRSR | Theater Required Supply Rate |
| TRU | Technical Reconnaissance Unit |
| TRU | Technical Research Unit |
| TS | Top Secret |
| TS/NF | Top Secret/No Foreign Dissemination |
| TSA | Technical Supplemental Allowance |
| TSC | Tandem Switching Center |
| TSL | Top Secret Limited Distribution |
| TSN | Tan Son Nhut (Air Base) |
| TSRD | Truong Son Revolutionary Development |
| TTY | Teletype |
| TU | Task Unit |
| Tu Cuong | Self-reliance |
| TUCR | Troop Unit Change Request |
| TV | Television |
| TW | Trial Watcher |
| TWV | Tactical Wheeled Vehicle |