| Term | Definition |
|---|---|
| Oboe |
Code name for British radio-navigational aid used by RAF bombers
|
| Octagon |
Code name for the second Quebec conference between Roosevelt and Churchill - September 1944
|
| OFEC |
Office of Foreign and Economic Co-ordination (USA)
|
| Oflag |
Offizier-Lager - "Officer Camp" German prisoner-of-war camps for Allied officers
|
| OKH |
Oberkommando der Heeres - High Command of the German Army
|
| OKL |
Oberkommando der Luftwaffe - High Command of the German Air Force
|
| OKM |
berkommando der Kriegsmarine - High Command of the German Navy
|
| OKW |
Oberkommando der Wehrmacht - High Command of the German Armed Forces
|
| Olive |
Operational code name for the Allied assault on the Gothic Line, Italy - August 1944
|
| Omaha |
Code name for one of the US Normandy beach landing areas used on D-Day, the site was between Coleville and Vierville
|
| OPD |
Operations Division of the US Department of War
|
| OSS |
Office of Strategic Services - US military intelligence and special operations agency
|
| Overlord |
Operational code name for Allied operations in Normandy and North West Europe, beginning with Operation Neptune on D-Day, 6th June 1944.
|
| OWI |
Office of War Information (USA)
|
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