| Abbreviation | Definition |
|---|---|
| PC2 | Postal Clerk Second Class |
| PC3 | Postal Clerk Third Class |
| PCA | Penetrator Core Ammunition |
| PCA | Personal Combat Armor |
| PCA | Physical Configuration Audit |
| PCA | Posse Comitatus Act |
| PCA | Powered Combat Armor |
| PCAC | Primary Control and Analysis Center |
| PCAPP | Pueblo Chemical Agent-Destruction Pilot Plant |
| PCARSS | Plant Clearance Automated Re-utilization Screening System |
| PCAS | Persistent Chemical Agent Simulant |
| PCAS | Primary Care Assessment Survey |
| PCAT | Personal Computer-Access Tool |
| PCB | Poly Chlorinated Biphenol |
| PCB | Printed Circuit Board |
| PCC | Chief Postal Clerk |
| PCC | Partnership Coordination Cell |
| PCC | Percentage of Correct Classification |
| PCC | Personnel Contingency Cell |
| PCC | Policy Coordination Committee |