| Abbreviation | Definition |
|---|---|
| 3RB | 3rd Ranger Battalion (US Army) |
| 4RD | Fourth Round |
| 4RD | Fourth Round - projectile. see also ~ “ second double tap “military term for confirmed kill |
| A | Analog |
| A&D | Admission and Disposition (report) |
| A&D | Aerospace and Defence |
| A&D | Aerospace and Defense |
| A&DSL | Administrative and Direct Support Logistics |
| A&ER | Ammunition and Explosives Regulations |
| A&P | Administrative and Personnel |
| A&P | Analysis and Prediction |
| A&Q | Alert and Que |
| A/C | Aircraft |
| A/D | Analog/Digital |
| A/DACG | Arrival/Departure Airfield Control Group |
| A/DCG | Arrival/Departure Control Group |
| A/E | Aircraft Engineering |
| A/E | Ammunition/Explosives |
| A/ETF | Automated/Electronic Target Folder |
| A/L | Administrative/Logistics |