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53d Airlift Squadron53d Electronic Warfare Group53d Fighter Squadron
53d Fighter Wing53d Test and Evaluation Group53d Weapons Evaluation Group
53d Weather Reconnaissance Squadron53d Wing53rd (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery
53rd (Shropshire) Regiment of Foot53rd (Welsh) Infantry Division53rd Anti-Aircraft Missile Brigade
53rd Anti-Aircraft Missile Regiment (Romania)53rd Anti-Aircraft Rocket Brigade53rd Army (Soviet Union)
53rd Battalion (Australia)53rd Battalion (Northern Saskatchewan), CEF53rd Brigade
53rd Brigade (United Kingdom)53rd Coast Artillery Regiment53rd Coast Artillery Regiment (United States)
53rd Corps (German Empire)53rd Division53rd Division (1st Formation)(People's Republic of China)
53rd Division (Imperial Japanese Army)53rd Illinois Infantry Regiment53rd Illinois Volunteer Infantry Regiment
53rd Indian Brigade53rd Indian Infantry Brigade53rd Indiana Infantry Regiment
53rd Infantry Brigade53rd Infantry Brigade Combat Team (United States)53rd Infantry Division (France)
53rd Infantry Division (Russian Empire)53rd Infantry Division Arezzo53rd Infantry Regiment (Imperial Japanese Army)
53rd Infantry Regiment (United States)53rd Mechanized Brigade (Ukraine)53rd Mountain Motorized Infantry Brigade (People's Republic of China)
53rd Ohio Infantry53rd Pennsylvania Infantry53rd Pennsylvania Infantry Regiment
53rd Regiment53rd Regiment Alabama Cavalry53rd Regiment Kentucky Volunteer Mounted Infantry
53rd Regiment Massachusetts Volunteer Infantry53rd Regiment of Foot (disambiguation)53rd Reserve Division (German Empire)
53rd Rifle Corps53rd Rifle Corps (Soviet Union)53rd Rifle Division (Soviet Union)
53rd Rocket Army53rd Sikhs (Frontier Force)53rd Transportation Battalion
53rd Troop Command53rd United States Colored Infantry53rd Virginia Infantry
53rd Wisconsin Volunteer Infantry Regiment540th Aircraft Control and Warning Group540th Combat Crew Training Wing
541st Aircraft Control and Warning Group541st Bombardment Squadron541st Parachute Infantry Regiment (United States)
542d Aircraft Control and Warning Group542d Combat Sustainment Wing542nd Grenadier Division (Wehrmacht)
542nd Parachute Infantry Regiment (United States)543d Aircraft Control and Warning Group543d Bombardment Squadron
543d Intelligence, Surveillance and Reconnaissance Group543d Tactical Support Group544th Aircraft Control and Warning Group
544th Bombardment Squadron544th Fighter Squadron544th Intelligence, Surveillance and Reconnaissance Group
545th Aircraft Control and Warning Group545th Bombardment Squadron545th Fighter Squadron
546th Aircraft Control and Warning Group546th Bombardment Squadron546th Fighter Squadron
547th Bombardment Squadron547th Intelligence Squadron548th Combat Training Squadron
548th Intelligence, Surveillance and Reconnaissance Group548th Strategic Missile Squadron549th Combat Training Squadron
549th Electrical and Mechanical Company, Royal Engineers549th Engineer Light Ponton Company549th Strategic Missile Squadron
54 Division (Sri Lanka)54th (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery54th (East Anglian) Infantry Division
54th (West Norfolk) Regiment of Foot54th Air Defense Corps54th Air Refueling Squadron
54th Airlift Squadron54th Anti-Aircraft Brigade (United Kingdom)54th Army (People's Republic of China)
54th Army (Soviet Union)54th Battalion (Australia)54th Battalion (Kootenay), CEF
54th Bombardment Squadron54th Brigade54th Corps (German Empire)
54th Division54th Division (Imperial Japanese Army)54th Division (People's Republic of China)
54th Engineer Battalion (United States)54th Fighter Group54th Fighter Squadron
54th Group Army54th Guards Fighter Aviation Regiment54th Guards Rifle Division
54th Guards Rocket Division54th Helicopter Squadron54th Illinois Infantry Regiment
54th Illinois Volunteer Infantry Regiment54th Indian Brigade54th Indiana Infantry Regiment
54th Infantry54th Infantry Brigade (United Kingdom)54th Infantry Division (German Empire)
54th Infantry Division (Russian Empire)54th Infantry Division Napoli54th Infantry Regiment
54th Infantry Regiment (France)54th Infantry Regiment (Imperial Japanese Army)54th Infantry Regiment (United States)
54th Massachusetts Infantry Regiment54th Massachusetts Volunteer Regiment54th Mechanized Brigade (Ukraine)
54th New York Volunteer Infantry54th Ohio Infantry54th Pennsylvania Infantry
54th Pennsylvania Infantry Regiment54th Regiment Kentucky Volunteer Mounted Infantry54th Regiment Massachusetts Volunteer Infantry
54th Regiment United States Colored Infantry54th Regiment of Foot (disambiguation)54th Reserve Division (German Empire)
54th Rifle Division (Soviet Union)54th Sikhs (Frontier Force)54th Tactical Fighter Wing
54th United States Colored Infantry54th Virginia Infantry54th Weather Reconnaissance Squadron
550th Airborne Infantry Battalion (United States)550th Fighter Squadron550th Guided Missiles Wing
550th Special Operations Squadron550th Strategic Missile Squadron551st Electronic Systems Wing
551st Parachute Infantry Battalion (United States)551st Signal Battalion (United States)551st Special Operations Squadron
551st Strategic Missile Squadron551st United States Air Force Hospital552 Squadron (Portugal)
552d Air Control Wing552d Fighter-Bomber Squadron553d Fighter-Bomber Squadron
553d Reconnaissance Squadron553rd Reconnaissance Squadron554th Electronic Systems Wing
554th Engineer Battalion (United States)554th Fighter-Bomber Squadron554th Reconnaissance Squadron
555 AMU Specialist Section555th Anti-Aircraft Rocket Regiment555th Engineer Brigade (United States)
555th Fighter Squadron555th Parachute Infantry Battalion (United States)556th Strategic Missile Squadron
556th Test and Evaluation Squadron557th Flying Training Squadron557th Moonlight Battery, Royal Artillery
557th Weather Wing558th Flying Training Squadron559th Bombardment Squadron
559th Flying Training Squadron55 Day War55 Division (Sri Lanka)
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