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October CrisisOctober IncidentOctober Revolution
October incidentOcéan-class ironcladOcéan-class ship of the line
Oda HidenobuOda HidetakaOda Katsunaga
Oda NobuharuOda NobuhideOda Nobuhiro
Oda NobukatsuOda NobunagaOda Nobutada
Oda NobutakaOda NobutokiOda Nobutoshi
Oda NobuyukiOda clanOdaenathus
Odai YorisadaOdani CastleOdartey Lamptey
Odas MoonOdawara CastleOdd Bull
Odd Fellows and Confederate CemeteryOdd Isaachsen WillochOdd Lindbäck-Larsen
Odd StarheimOdd ØyenOddmund Hammerstad
Oddusuddan offensive (1999)Ode: Sung on the Occasion of Decorating the Graves of the Confederate Dead at Magnolia Cemetery, Charleston, S.C., 1867Ode of Remembrance
Oded BrigadeOdell CastleOdell House
Odell K. CassadaOdell M. ConoleyOdell Pollard
Oden-class coastal defence shipOdendaalsrus CommandoOderwerke
Oder–Neisse lineOdessa-Nikolaev MarchOdessa Bolshevik Uprising
Odessa Bolshevik uprisingOdessa Flight StripOdessa Military District
Odessa Operation (1919)Odessa Operation (1920)Odet of Foix, Viscount of Lautrec
Odette HallowesOdiham CastleOdilo Globocnik
Odilo GlobočnikOdin-class coastal defense shipOdin-class submarine
Odiorne Point State ParkOdlanier MenaOdo, Earl of Kent
Odo Arpin of BourgesOdo I, Duke of BurgundyOdo II, Count of Blois
Odo III, Duke of BurgundyOdo II of ChamplitteOdo de St Amand
Odo of DeuilOdo of GasconyOdo the Great
OdoacerOdoardo ToscaniOdon Bacqué
Odon GuitarOdon de PinsOdong Latek
OdotheusOdus Creamer HorneyOdy Abbott
Odysseas AndroutsosOdysseas AngelisOdzaberd
Odziena ManorOeffag C.IOeffag G
Oerip SoemohardjoOerlikon 20 mm cannonOerlikon 30 mm twin cannon
Oerlikon 35 mm twin cannonOerlikon FFOerlikon GAI-BO1
Oerlikon GDFOerlikon KBAOerlikon KCA
Oerlikon Millennium 35 mm Naval Revolver Gun SystemOerlikon SSG36Oeselians
Ofek unitOfeqOff Tackle (war plan)
Offa's DykeOffa of MerciaOffenbach Archival Depot
Offences against military law in the United KingdomOffensive (military)Offensive counter air
Offensive grenade wz. 24Offensive on Mariupol (September 2014)Offerman's Island
Office for the Administrative Review of the Detention of Enemy CombatantsOffice of Australian War GravesOffice of Civil Defense
Office of Civil Defense (Philippines)Office of Defense Cooperation TurkeyOffice of Defense Mobilization
Office of Detainee AffairsOffice of Economic AdjustmentOffice of Emergency Planning (Ireland)
Office of Force TransformationOffice of Intelligence and Analysis (Treasury Department)Office of Legislative Affairs (United States Navy)
Office of Military Government, United StatesOffice of National AssessmentsOffice of Naval Intelligence
Office of Naval MaterialOffice of Naval ResearchOffice of Net Assessment
Office of Production ManagementOffice of Scientific IntelligenceOffice of Scientific Research and Development
Office of Special PlansOffice of Strategic ServicesOffice of Technical Service
Office of War MobilizationOffice of the Administrative Assistant to the Secretary of the ArmyOffice of the Chief, Army Reserve
Office of the Chief Legislative Liaison (United States Army)Office of the Chief of Defence StaffOffice of the Inspector General, U.S. Department of Defense
Office of the Joint Chiefs of Staff Identification BadgeOffice of the Military Advisor to the Commonwealth Government of the PhilippinesOffice of the Program Manager, Saudi Arabian National Guard Modernization Program
Office of the Secretary of DefenseOffice of the Secretary of Defense Identification BadgeOffice of the Secretary of Homeland Security Identification Badge
Office of the Secretary of Transportation Identification BadgeOfficerOfficer's Call
Officer (armed forces)Officer CadetOfficer Cadet School, Portsea
Officer Cadet School (Singapore)Officer CandidateOfficer Candidate School
Officer Candidate School (Indonesian Army)Officer Candidate School (United States Army)Officer Candidate School (United States Navy)
Officer Candidate School – PhilippinesOfficer Candidates School (United States Marine Corps)Officer Commanding
Officer Concentration Station RothesayOfficer Concentration Station RothsayOfficer Corps of the Royal Navy
Officer Qualification RecordOfficer RanksOfficer Selection Officer
Officer Training Command NewportOfficer Training School ROKAFOfficer Training Unit, Scheyville
Officer and Aircrew Selection CentreOfficer cadetOfficer candidate
Officer commandingOfficer in Charge of Construction RVNOfficer in tactical command
Officer of the dayOfficer ranks (Denmark)Officer selection officer
Officer trainingOfficers' AssociationOfficers' Christian Fellowship
Officers' Commissions Act 1862Officers' Training CorpsOfficers' Training School RAAF
Officers Quarters, Washington Navy YardOfficers RowOfficers Training Academy
Officers of the County of TripoliOfficers of the Kingdom of CyprusOfficial History of Australia in the War of 1914–1918
Official History of Australian Peacekeeping, Humanitarian and Post-Cold War OperationsOfficial History of New Zealand in the Second World War 1939–45Official History of the Canadian Army in the Second World War
Official IRA Belfast BrigadeOfficial Irish Republican ArmyOfficial Painter of the French Air Force
Official Records of the American Civil WarOfficial Records of the War of the RebellionOfficial Secrets Act (India)
Official historyOfficial numberOfficier d'épée
Officier de plumeOffiziersstellvertreterOffizierstellvertreter
Offset agreementOffshore PatrolOffshore Patrol Cutter
Offshore Raiding CraftOffutt Air Force BaseOfilius Calavius
Ofira Air BattleOflagOflag 64
Oflag 79Oflag II-AOflag II-C
Oflag II-DOflag IV-AOflag IV-B Koenigstein
Oflag IV-B KönigsteinOflag IV-COflag IV-D
Oflag IX-A/HOflag IX-COflag V-B
Oflag VI-BOflag VII-A MurnauOflag VII-B
Oflag VII-COflag VII-DOflag VIII-E Johannisbrunn
Oflag VIII-FOflag X-BOflag X-C
Oflag X-DOflag XII-AOflag XII-B
Oflag XIII-AOflag XIII-BOflag XVII-A
Oflag XXI-BOflag XXI-COg Mandino
Ogaden National Liberation FrontOgaden WarOgasawara Nagahide
Ogasawara NaganariOgasawara NagatokiOgasawara Sadamune
Ogasawara TadazaneOgasawara clanOgata Gekkō
Ogawa MatajiOgawa SuketadaOgbunigwe
Ogden's CavalryOgden Air Logistics ComplexOgden Bruton
Ogden H. HammondOgden HoffmanOgden J. Ross
Ogden PhippsOgden R. ReidOgdensburg Agreement
Ogdensburg ArmoryOghabOgle Hall
Oglethorpe's RegimentOglethorpe BarracksOgliuga Island Army Airfield
Ogmore CastleOgmund CrouchdanceOgnevoy-class destroyer
Ognjeslav Kostović StepanovićOgura ByōichirōOh! Frenchy
Oh! How I Hate to Get Up in the MorningOh, Charlie Is My Darling
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