Military abbreviations: O

A glossary of military-based abbreviations, acronyms and initials used throughout the First World War, the Second World War and through to present day. The abbreviations are associated with various different nations, primarily the United Kingdom but also including, India, South Africa, USA, New Zealand and Australia. Abbreviations also have a strong focus on various armed forces such as the British Army, Royal Navy and Royal Air Force. Use the browse prefix below to navigate to glossaries beginning with a specific letter.

Contents:  A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z
Abbreviation	Definition 1	Definition 2 (if applicable)
OBE	Officer of the Order of the British Empire
OBLI	Oxfordshire and Buckinghamshire Light Infantry
OC	Officer Commanding	Officers Clerk (RN)
OCTU	Officer Cadet Training Unit
OL	Ordnance Lieutenant (RN)
OMGUS	Office of the Military Government (US)
OP	Observation Post
OR	Other Ranks
ORB	Operations Record Book (RAF)
ORD	Ordinary Seaman (RN)
OS	Officers Steward (RN)	Ordinary Seaman (RN)
OSS	Office of Strategic Studies (US)
OTC	Officer Training Corps
O TEL	Ordinary Telegraphist (RN)
OTU	Operational Training Unit (RAF)
OWI	Office of War Information
OX & BUCKS LI	Oxfordshire and Buckinghamshire Light Infantry
OXF YEO	Oxfordshire Yeomanry