| Abbreviation | Definition |
|---|---|
| PA | Physician's Assistant |
| PA | Post Apocalypse |
| PA | Powered Armor |
| PA | Precautionary Approach |
| PA | Primary Agency |
| PA | Probability of Arrival |
| PA | Processing Activities |
| PA | Procurement Army |
| PA | Product Assurance |
| PA | Public Affairs |
| PA&E | Program Analysis and Evaluation |
| PA&T | Product Assurance and Test |
| PAA | Pintle Adapter Assembly |
| PAA | Position Area of Artillery |
| PAA | Primary Aircraft Authorization |
| PAACE | Precision Aircraft Armament Control Experiment |
| PAAF | Pecos Army Air Field |
| PAAF | Pratt Army Air Field |
| PABT | Pilot Aptitude Battery Test |
| PABX | Private Automatic Branch Exchange |