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Military Airband > Callsigns > O
| CALLSIGN | TYPE | SQUADRON | BASED | DATE HEARD |
| OBI | HAWK T.1/T.1A | 4 FTS | VALLEY | |
| OBLONG | VARIOUS | EXERCISE | EXERCISE | |
| OCTOPUSS | NIMORD | KINLOSS | ||
| ODIN | VARIOUS | FJ&W0EU | CONINGSBY | |
| OGRE | MERLIN HC3 | 28 SQN | BENSON | |
| OKIE | E-3/KC-135 | TINKER | ||
| OLIVE | RC-135 | OFFUTT | ||
| OMEN | C-130 HERCULES | LTW | LYNEHAM | |
| OPEC | KC-10 | MCGUIRE | ||
| ORANGE | F-16 | RNAF | ||
| OSPREY | HAWK | 208 SQN | VALLEY | |
| OTIS | KC-130 HERCULES | VMGR252 | CHERRY POINT | |
| OUTLAW | VARIOUS | 9 RGT AAC | DISHFORTH | |
| OUZI | JAGUAR | 6 SQN | CONINGSBY | RETIRED |