| AA |
Antiaircraft |
| AIRSOLS |
Allied air command for the Solomons (also used for commander, AIRSOLS) |
| Belconnen |
Station name for U.S. Navy codebreakers in Australia, 1942–1945 (aka FRUMEL) |
| CAG |
Carrier Air Group |
| Cast |
Station name for U.S. Navy codebreakers in the Philippines, 1941–1942 |
| C-in-C |
Commander in chief (Japanese) |
| CINCPAC |
Commander in chief, Pacific Ocean areas |
| COMINCH |
Commander in chief (U.S.—also the chief of naval operations) |
| CUB |
Navy Base Unit |
| FRUMEL |
Fleet Radio Unit Melbourne |
| FRUPAC |
Fleet Radio Unit Pacific |
| GC&CS |
Government Code & Communications School (British) |
| GI |
Government-issue (common usage for a U.S. soldier) |
| G-2 |
U.S. Army Intelligence (also Southwest Pacific Theater Intelligence) |
| HMS |
His Majesty’s Ship (in a ship name) |
| Hypo |
Station name for U.S. Navy codebreakers at Pearl Harbor, 1941–1943 (became FRUPAC) |
| ICPOA |
Intelligence Center, Pacific Ocean area |
| IGHQ |
Imperial General Headquarters |
| JNAF |
Japanese Naval Air Force |
| MAG |
Marine Air Group |
| NEGAT |
Station name for OP-20-G codebreaking activities |
| NGS |
Navy General Staff |
| ONI |
Office of Naval Intelligence |
| OP-20-G |
Codebreaking organization of the Office of Naval Communications (aka Station Negat) |
| SBD |
Douglas Dauntless dive-bomber |
| SEFIC |
Seventh Fleet Intelligence Center |
| SNLF |
Special Naval Landing Force |
| SOPAC |
South Pacific Command (also used for commander, South Pacific) |
| SOWESPAC |
Southwest Pacific Theater command |
| TBF |
Grumman Avenger torpedo plane |
| TBS |
Talk Between Ships (low-frequency intership radio net) |
| USS |
United States Ship (in a ship name) |
| VB |
Navy carrier-based dive-bomber squadron |
| VF |
Navy carrier-based fighter squadron |
| VMF |
Marine fighter squadron |
| VMSB |
Marine scout bomber squadron |
| VSB |
Navy carrier-based scout bomber squadron |