| ORB |
Operational Record Book |
| OTC |
Officers Training Corps |
| Pbr |
Probationary Observer |
| PLM |
Pour le Mérite |
| POW |
Prisoner Of War |
| Pvt |
Private |
| RAE |
Royal Aircraft Establishment |
| RAF |
Royal Aircraft Factory |
| RAF |
Royal Air Force |
| RC |
Record of Combats |
| RFC |
Royal Flying Corps |
| Rittm |
Rittmeister |
| RNAS |
Royal Naval Air Service |
| ROTC |
Reserve Officers' Training Camp (or Corps) |
| ROTFL |
Rolling on the floor laughing |
| RPM |
Revolutions Per Minute |
| SD |
Squadron Diary |
| Sgt |
Sergeant |
| SPAD |
Société Anonyme Pour L'Aviation et ses Dérives |
| SR |
Squadron Records |
|
