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51st Division (Imperial Japanese Army)51st Division (Philippines)51st Expeditionary Signal Battalion
51st Fighter Squadron51st Fighter Wing51st Georgia Volunteer Infantry
51st Guards Artillery Brigade (Belarus)51st Guards Artillery Division51st Guards Mechanized Brigade (Ukraine)
51st Illinois Infantry Regiment51st Illinois Volunteer Infantry Regiment51st Indian Brigade
51st Indian Infantry Brigade51st Indiana Infantry Regiment51st Infantry Brigade (United Kingdom) and Headquarters Scotland
51st Infantry Brigade and Headquarters Scotland51st Infantry Division (Russian Empire)51st Infantry Division (United States)
51st Infantry Division Siena51st Infantry Regiment (United States)51st Iowa Volunteer Infantry Regiment
51st Iowa Volunteers51st Logistics Battalion (Belgium)51st Mechanized Brigade (Ukraine)
51st New York Volunteer Infantry51st Ohio Infantry51st Operations Group
51st Pennsylvania Infantry51st Pennsylvania Infantry Regiment51st Regiment
51st Regiment Massachusetts Volunteer Infantry51st Regiment of Foot (disambiguation)51st Reserve Division (German Empire)
51st Rifle Corps51st Rifle Corps (Soviet Union)51st Rifle Division (Soviet Union)
51st Sikhs (Frontier Force)51st Troop Carrier Squadron51st Troop Carrier Wing
51st United States Colored Infantry Regiment51st Virginia Infantry51st Wisconsin Volunteer Infantry Regiment
52-foot Motor Lifeboat520th520th Air Defense Group
520th Fighter-Interceptor Squadron521st521st Air Defense Group
521st Air Mobility Operations Wing521st Fighter-Bomber Squadron522d Special Operations Squadron
522nd523d Fighter Squadron524th Bombardment Squadron
524th Special Operations Squadron525th (Antrim) Coast Regiment, Royal Artillery525th Air Defense Group
525th Battlefield Surveillance Brigade525th Bombardment Squadron525th Expeditionary Military Intelligence Brigade
525th Fighter Squadron525th Military Intelligence Brigade526th Bombardment Squadron
526th Fighter Squadron526th Intercontinental Ballistic Missile Systems Group527th Air Defense Group
527th Bombardment Squadron527th Space Aggressor Squadron528th Air Defense Group
528th Bomb Squadron528th Engineer Battalion528th Support Battalion (United States)
528th Sustainment Brigade (United States)529th Air Defense Group529th Bombardment Squadron
52 Division (Sri Lanka)52d Airlift Squadron52d Bombardment Squadron
52d Combat Communications Squadron52d Expeditionary Flying Training Squadron52d Fighter-Interceptor Squadron
52d Fighter Squadron52d Fighter Wing52d Operations Group
52d Troop Carrier Wing52nd (London) Heavy Anti-Aircraft Regiment, Royal Artillery52nd (Lowland) Infantry Division
52nd (Oxfordshire) Regiment of Foot52nd Air Defense Artillery Regiment52nd Air Defense Artillery Regiment (United States)
52nd Anti-Aircraft Brigade52nd Armoured Regiment (India)52nd Army (Soviet Union)
52nd Artillery Brigade (Russian Empire)52nd Aviation Regiment52nd Aviation Regiment (United States)
52nd Battalion (Australia)52nd Battalion (New Ontario), CEF52nd Brigade
52nd Cavalry Division (Soviet Union)52nd Corps (German Empire)52nd Division
52nd Division (Imperial Japanese Army)52nd Engineer Division (People's Republic of China)52nd Fighter Wing
52nd Illinois Infantry Regiment52nd Illinois Volunteer Infantry Regiment52nd Indian Brigade
52nd Indiana Infantry Regiment52nd Infantry Battalion (Cadre)52nd Infantry Brigade (United Kingdom)
52nd Infantry Division (German Empire)52nd Infantry Division (Russian Empire)52nd Infantry Division (Wehrmacht)
52nd Infantry Division Torino52nd Infantry Regiment (United States)52nd Light Anti-Aircraft Brigade (United Kingdom)
52nd Lowland Regiment52nd Motorised Division Torino52nd Mountain Motorized Infantry Brigade (People's Republic of China)
52nd New York Volunteer Infantry52nd Ohio Infantry52nd Ordnance Group (EOD)
52nd Pennsylvania Infantry52nd Pennsylvania Infantry Regiment52nd Ranger Battalion (South Vietnam)
52nd Regiment Kentucky Volunteer Mounted Infantry52nd Regiment of Foot (disambiguation)52nd Reserve Division (German Empire)
52nd Rifle Corps52nd Rifle Corps (Soviet Union)52nd Rocket Division
52nd Sikhs (Frontier Force)52nd Tennessee Infantry Regiment52nd United States Colored Infantry
52nd Virginia Infantry52nd Wisconsin Volunteer Infantry Regiment530th Air Defense Group
530th Air Force Band530th Bombardment Squadron531st Bombardment Squadron
531st Fighter Squadron531st Tactical Fighter Squadron532d Training Squadron
532nd Engineer Boat and Shore Regiment533d Air Defense Group533d Training Squadron
534th Air Defense Group534th Bombardment Squadron534th Training Squadron
535th Airlift Squadron535th Bombardment Squadron536th Tactical Airlift Squadron
537th Airlift Squadron538th Air Expeditionary Advisory Squadron538th Fighter-Interceptor Squadron
538th Frontier Guard Division (Wehrmacht)539 Assault Squadron RM539th Fighter-Interceptor Squadron
53T653 (Louisburg) Battery RA53 (Wales & Western) Signal Squadron
53 (Welsh) Signal Squadron53 Division (Sri Lanka)
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