| Abbreviation | Definition |
|---|---|
| NA | Not Approved |
| NAADC | North American Aerospace Defense Command |
| NAAFI | Navy Army Air Force Institution |
| NAAFI | Navy, Army, and Air Force Institute |
| NAAG | NATO Army Armament Group |
| NAAG | NATO Army Armaments Group |
| NAAG | North Atlantic Treaty Organization (NATO) Army Armaments Group |
| NAAK | Nerve Agent Antidote Kit |
| NAB | Naval Amphibious Base |
| NABK | NATO Armaments Ballistic Kernel |
| NAC | National Agency Check |
| NAC | National Armed Comrades |
| NAC | National Automotive Center |
| NAC | Nato Advisory Council |
| NAC | North American Aerospace Defense Command (NORAD) Air Center |
| NAC | North Atlantic Council ( NATO) |
| NAC | North Atlantic Council (NATO) |
| NACC | North Atlantic Cooperation Council |
| NACE | National Military Command System (NMCS) Automated Control Executive |
| NACF | Northumbria Army Cadet Force |