- Ordnance QF 6-pounder
- Ordnance QF 75 mm
- Ordnance QF 95 mm howitzer
- Ordnance Survey
- Ordnance Survey Drawings
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- Ordos Campaign (1592)
- Ordos campaign
- Ordos campaign (1592)
- Ordre de la Santé publique
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- Orel H. Lev
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- Oren (spy)
- Oren Frood
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- Orenburg (air base)
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- Orenburg Higher Military Aviation School for Pilots
- Orenburg Independent Army
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- Oreste Baratieri
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- Orestes (5th century general)
- Orestes (father of Romulus Augustulus)
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- Orfey-class destroyer
- Orford Castle
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- Organic unit
- Organisation Militaire Belge de Résistance
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- Organisation civile et militaire
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- Organisation of National Ex-Servicemen
- Organisation of Young Free Algerians
- Organisation of a SS Panzer Division
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- Organization X
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- Organization for Security and Co-operation in Europe
- Organization for the Protection of the People's Struggle
- Organization of Canadian Army rifle sections during World War II
- Organization of Japanese defensive units in Okinawa
- Organization of Japanese forces in Dutch Indies
- Organization of Japanese forces in Southeast Asia
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- Organization of Kita and Minami Fortresses
- Organization of Military Museums of Canada
- Organization of Ukrainian Nationalists
- Organization of United States Air Force Units in the Gulf War
- Organization of United States Naval Aviation Units in the Gulf War
- Organization of the Air Service of the American Expeditionary Force
- Organization of the Armed Forces of the Russian Federation
- Organization of the Communist Party of China
- Organization of the Imperial Japanese Army
- Organization of the Imperial Japanese Navy Air Service
- Organization of the Imperial Japanese Navy Alaskan Strike Group
- Organization of the Kwantung Army
- Organization of the Luftwaffe
- Organization of the Third Reich
- Organization of the U.S. Army Air Service in 1925
- Organization of the United States Coast Guard
- Organization of the United States Marine Corps
- Organizational Excellence Award
- Organizational structure of the United States Department of Defense
- Orgetorix
- Orglandes German war cemetery
- Orhan
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- Oriani-class destroyer
- Oribi Commando
- Orient Shield exercise
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- Oriental Crisis of 1840
- Oriental Institute in Sarajevo
- Oriental Powder Company
- Oriental Titan UAV
- Orienteering at the 2019 Military World Games
- Oriflamme
- Origin-12
- Origin of the Huns
- Original Child Bomb
- Original six frigates of the United States Navy
- Origins of the American Civil War
- Origins of the Cold War
- Origins of the French Foreign Legion
- Origins of the Royal Canadian Navy
- Origins of the Sino-Indian War
- Origins of the War of 1812
- Orillon Batteries
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- Orin G. Murfin
- Orin Lehman
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- Oringe Smith Crary
- Orion-class battleship
- Orion-class submarine
- Orion (satellite)
- Orion P. Howe
- Orione-class torpedo boat
- Orisi Rabukawaqa
- Oriskany Battlefield State Historic Site
- Orit Adato
- Orita M1941
- Orizoba Spence
- Orița M1941
- Orjen-class torpedo boat
- Orkan-class fast attack craft
- Orkestar OSBiH
- Orkhan Sultanov
- Orkney Commando
- Orkney Fortress Royal Engineers
- Orkney Wireless Museum
- Orkneyinga saga
- Orkoiyot
- Orla Møller
- Orlan-10
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- Orland K. Armstrong
- Orland Smith
- Orland Steen Loomis
- Orlando-class cruiser
- Orlando B. Ficklin
- Orlando B. Willcox
- Orlando Boss
- Orlando Bridgeman, 1st Earl of Bradford
- Orlando Bridgeman, 3rd Earl of Bradford
- Orlando Bridgeman, 5th Earl of Bradford
- Orlando Bridgeman (RAF officer)
- Orlando Burrell
- Orlando Busino
- Orlando DiGirolamo
- Orlando E. Caruana
- Orlando Ellsworth
- Orlando Executive Airport
- Orlando Fighter Wing
- Orlando Henderson Petty
- Orlando J. Heinitz
- Orlando J. Hodge
- Orlando J. Smith
- Orlando Kellogg
- Orlando Llenza
- Orlando Lorenzini
- Orlando Metcalfe Poe
- Orlando Norie
- Orlando Ortiz Chevres
- Orlando P. Vaughan
- Orlando Ramón Agosti
- Orlando Reeves
- Orlando Sanchez (politician)
- Orlando Ward
- Orlando d'Aragona
- Orleansville Airfield
- Orli Markman
- Orlik Aerobatic Team
- Orlo K. Steele
- Orlogsværftet
- Orlov revolt
- Orlovka
- Orlovka (air base)
- Orlow Smith
- Orly Air Base
- Orly Airport attack
- Orléans – Bricy Air Base
- Orlík Castle
- Orm Pleasents
- Ormacleit Castle
- Orme Bigland Clarke
- Orme G. Stuart
- Ormen Lange (longship)
- Ormer Locklear
- Ormiston Castle
- Ormon Khan
- Ormond Burton
- Ormond Castle
- Ormond R. Simpson
- Ormonde Winter
- Ormsby-class attack transport
- Ormsby B. Thomas
- Ormsby M. Mitchel
- Ormsby Vandeleur
- Orna Barbivai
- Oro Bay Airfield
- Orobius
- Oromia–Somali clashes
- Oromo Liberation Army
- Oromo Liberation Front
- Oromo conflict
- Oromo conflict (2021)
- Oron Castle
- Orongokoekoea Pā
- Orontes I
- Orontes II
- Orontes River offensive
- Oropesa
- Oropesa (minesweeping)
- Orote Field
- Orozimbo Barbosa
- Orphan Brigade
- Orpheus S. Woodward
- Orren Bennett
- Orren R. Whiddon
- Orrin E. Hine
- Orrin Keepnews
- Orrin L. Mann
- Orrington Lunt
- Orris E. Kelly
- Orris S. Ferry
- Orry-Kelly
- Orsa-class torpedo boat
- Orsamus Cook Merrill
- Orsamus S. Barnes
- Orscholz Switch
- Orsha offensives (1943)
- Orsini-Colonna Castle
- Orsis T-5000
- Orsk (air base)
- Orsk Airport
- Orson Bean
- Orson Flagg Bullard
- Orson Leon Crandall
- Orson Minott Oviatt
- Orson Swindle
- Orson W. Bennett
- Orsova Offensive
- Ortenstein Castle
- Ortgies Semi-Automatic Pistol
- Ortha O. Barr, Jr.
- Orthez 1814 order of battle
- Ortnek Castle
- Ortsgruppenleiter
- Ortwin Gamber
- Ortwin Kuske
- Ortún Velázquez de Velasco
- Oruzgan police station attack of January 2002
- Oruç Reis
- Oruç Reis-class submarine
- Orval Faubus
- Orval H. Hansen
- Orval R. Cook
- Orvan Hess
- Orvil A. Anderson
- Orville Alfred Ralston
- Orville Buckner
- Orville Bullington
- Orville C. Pratt
- Orville C. Zink
- Orville E. Babcock
- Orville E. Birnstihl
- Orville Edwin Langley
- Orville Emil Bloch
- Orville Freeman
- Orville Hewitt
- Orville Hickman Browning
- Orville Lamplough
- Orville Lee Bandy
- Orville Mohler
- Orville Moody
- Orville Nave
- Orville Pottenger
- Orville Sievwright Tyndale
- Orville T. Chamberlain
- Orville Zimmerman
- Orvin B. Fjare
- Orvis Sigler
- Oryoku Maru
- Oryol Front
- Oryol Prison
- Oryol Yuzhny Airport
- Orzeł-class submarine
- Orzeł incident
- Orénoque (1781)
- Orénoque (1781 ship)
- Oršić Castle in Gornja Stubica
- Osa-class missile boat
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