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OfficerOfficer's CallOfficer (armed forces)
Officer CadetOfficer Cadet School, PortseaOfficer Cadet School (Singapore)
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Officer Candidate School (United States Army)Officer Candidate School (United States Navy)Officer Candidate School – Philippines
Officer Candidates School (United States Marine Corps)Officer CommandingOfficer Concentration Station Rothesay
Officer Concentration Station RothsayOfficer Corps of the Royal NavyOfficer Qualification Record
Officer RanksOfficer Selection OfficerOfficer Training Command Newport
Officer Training School ROKAFOfficer Training Unit, ScheyvilleOfficer and Aircrew Selection Centre
Officer cadetOfficer candidateOfficer commanding
Officer in Charge of Construction RVNOfficer in tactical commandOfficer of the day
Officer ranks (Denmark)Officer selection officerOfficer training
Officers' AssociationOfficers' Christian FellowshipOfficers' Commissions Act 1862
Officers' Training CorpsOfficers' Training School RAAFOfficers Quarters, Washington Navy Yard
Officers RowOfficers Training AcademyOfficers of the County of Tripoli
Officers of the Kingdom of CyprusOfficial History of Australia in the War of 1914–1918Official History of Australian Peacekeeping, Humanitarian and Post-Cold War Operations
Official History of New Zealand in the Second World War 1939–45Official History of the Canadian Army in the Second World WarOfficial IRA Belfast Brigade
Official Irish Republican ArmyOfficial Painter of the French Air ForceOfficial Records of the American Civil War
Official Records of the War of the RebellionOfficial Secrets Act (India)Official history
Official numberOfficier d'épéeOfficier de plume
OffiziersstellvertreterOffizierstellvertreterOffset agreement
Offshore PatrolOffshore Patrol CutterOffshore Raiding Craft
Offutt Air Force BaseOfilius CalaviusOfira Air Battle
OflagOflag 64Oflag 79
Oflag II-AOflag II-COflag II-D
Oflag IV-AOflag IV-B KoenigsteinOflag IV-B Königstein
Oflag IV-COflag IV-DOflag IX-A/H
Oflag IX-COflag V-BOflag VI-B
Oflag VII-A MurnauOflag VII-BOflag VII-C
Oflag VII-DOflag VIII-E JohannisbrunnOflag VIII-F
Oflag X-BOflag X-COflag X-D
Oflag XII-AOflag XII-BOflag XIII-A
Oflag XIII-BOflag XVII-AOflag XXI-B
Oflag XXI-COg MandinoOgaden National Liberation Front
Ogaden WarOgasawara NagahideOgasawara Naganari
Ogasawara NagatokiOgasawara SadamuneOgasawara Tadazane
Ogasawara clanOgata GekkōOgawa Mataji
Ogawa SuketadaOgbunigweOgden's Cavalry
Ogden Air Logistics ComplexOgden BrutonOgden H. Hammond
Ogden HoffmanOgden J. RossOgden Phipps
Ogden R. ReidOgdensburg AgreementOgdensburg Armory
OghabOgle HallOglethorpe's Regiment
Oglethorpe BarracksOgliuga Island Army AirfieldOgmore Castle
Ogmund CrouchdanceOgnevoy-class destroyerOgnjeslav Kostović Stepanović
Ogura ByōichirōOh! FrenchyOh! How I Hate to Get Up in the Morning
Oh, Charlie Is My DarlingOh Chong-songOh How I Wish I could Sleep Until My Daddy Comes Back Home
Ohama KagetakaOhatsuOhio-class submarine
Ohio Air National GuardOhio Army National GuardOhio Company
Ohio CountryOhio Defense ForceOhio Military Reserve
Ohio National GuardOhio Naval MilitiaOhio Renaissance Festival
Ohio Replacement SubmarineOhio Veterans PlazaOhio Wing Civil Air Patrol
Ohio World War II Army AirfieldsOhio in the American Civil WarOhio in the War
Ohio in the War of 1812Ohio–Hungary National Guard PartnershipOhio–Serbia National Guard Partnership
Ohlsdorf CemeteryOhlson Mountain Air Force StationOhrana
Ohrdruf concentration campOhrid AgreementOhrid–Debar uprising
Oi ShigemotoOi YukiyoshiOil Campaign of World War II
Oil Campaign targets of World War IIOil City ArmoryOil Platforms (Islamic Republic of Iran v United States of America)
Oil Platforms caseOil campaign chronology of World War IIOil campaign of World War II
Oil warOise-Aisne American Cemetery Plot EOise-Aisne American Cemetery and Memorial
Oiva TuominenOjców CastleOjhri Camp
Ojika class patrol vesselOjo de Agua RaidOka Crisis
Oka GorodovikovOka IchinosukeOka Ivanovich Gorodovikov
Okabayashi ShokenOkabe MotonobuOkada Izō
Okada ShigetakaOkada ShigeyoshiOkapi MPV
Okara CantonmentOkay Hot-Shot, Okay!Okayama Castle
Okazaki CastleOkba Ibn Nafa Air BaseOkeechobee Battlefield
OkehamptonOkehampton CastleOketz Unit
OkhankanyiweyoOkhtyrka (air base)Okhtyrka Air Base
Okikatsu AraoOkill Massey LearmonthOkinawa Marine
Okinawa Memorial DayOkinawa ground order of battleOkinori Kaya
Okita RintarōOkita SōjiOklahoma Air National Guard
Oklahoma Army National GuardOklahoma City Air Defense SectorOklahoma City Air Force Station
Oklahoma City Air Logistics CenterOklahoma City Air Logistics ComplexOklahoma City sonic boom tests
Oklahoma Military DepartmentOklahoma National GuardOklahoma State Guard
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Okmulgee (YTB-765)OknoOkno-S
OkoOkot OdhiamboOkoř Castle
Oksøy-class mine hunterOktawiusz RadoszkowskiOktay Yıldırım
Oku YasukataOkudaira NobumasaOl-class tanker (1936)
Ol-class tanker (1965)Ola FritznerOla Ibrahim
Ola L. MizeOla Mildred RexroatOladayo Popoola
Oladeinde JosephOladipo DiyaOlaf Helset
Olaf II of NorwayOlaf I of NorwayOlaf Kullmann
Olaf M. HustvedtOlaf Nikolas OlsenOlaf Rye
Olaf SchmidOlaf TryggvasonOlans Johnsen
Olathe Air Force StationOlaus JohnsenOlav Aspheim
Olav BergersenOlav NilssonOlav Ringdal
Olav RisteOlav UgjævaOlav V of Norway
Olavi PuroOlavinlinnaOlavsvern
Olayinka SuleOld-Lady-Grieves-the-EnemyOld Abe
Old Artillery Barracks, ChristianshavnOld Artillery GroundOld Baldy (horse)
Old Bank Road drill hall, GolspieOld Barracks MuseumOld Beaupre Castle
Old Bill WilliamsOld BlockhouseOld Cadet Chapel (West Point)
Old Camp VerdeOld Capitol PrisonOld Castle (Koblenz)
Old Castle (Stuttgart)Old Castle LachlanOld Castle in Żywiec
Old Christian Cemetery, AbbottabadOld City Hall Cenotaph, TorontoOld City of Zuoying
Old Falkenstein CastleOld Fort ErieOld Fort Harrod State Park
Old Fort JohnsonOld Fort Park and Golf CourseOld Fort Pierce Park
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