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- 51st Wisconsin Volunteer Infantry Regiment
- 52-foot Motor Lifeboat
- 520th
- 520th Air Defense Group
- 520th Fighter-Interceptor Squadron
- 521st
- 521st Air Defense Group
- 521st Air Mobility Operations Group
- 521st Air Mobility Operations Wing
- 521st Fighter-Bomber Squadron
- 522d Special Operations Squadron
- 522nd
- 523d Fighter Squadron
- 524 Squadron
- 524th Bomb Squadron
- 524th Bombardment Squadron
- 524th Special Operations Squadron
- 525th (Antrim) Coast Regiment, Royal Artillery
- 525th Air Defense Group
- 525th Battlefield Surveillance Brigade
- 525th Bombardment Squadron
- 525th Expeditionary Military Intelligence Brigade
- 525th Fighter Squadron
- 525th Military Intelligence Brigade
- 526th Bombardment Squadron
- 526th Fighter Squadron
- 526th Infantry Division
- 526th Intercontinental Ballistic Missile Systems Group
- 527th Air Defense Group
- 527th Bombardment Squadron
- 527th Space Aggressor Squadron
- 528th Air Defense Group
- 528th Bomb Squadron
- 528th Engineer Battalion
- 528th Support Battalion (United States)
- 528th Sustainment Brigade (United States)
- 529th Air Defense Group
- 529th Bombardment Squadron
- 52 Division (Sri Lanka)
- 52 Medium Regiment
- 52d Airlift Squadron
- 52d Bombardment Squadron
- 52d Combat Communications Squadron
- 52d Expeditionary Flying Training Squadron
- 52d Fighter-Interceptor Squadron
- 52d Fighter Squadron
- 52d Fighter Wing
- 52d Operations Group
- 52d Troop Carrier Wing
- 52nd (East Lancashire) Light Anti-Aircraft Regiment, Royal Artillery
- 52nd (London) Heavy Anti-Aircraft Regiment, Royal Artillery
- 52nd (Lowland) Infantry Division
- 52nd (Lowland) Volunteers (United Kingdom)
- 52nd (Manchester) Field Regiment, Royal Artillery
- 52nd (Oxfordshire) Regiment of Foot
- 52nd Air Defense Artillery Regiment
- 52nd Anti-Aircraft Brigade
- 52nd Armoured Regiment (India)
- 52nd Army (Soviet Union)
- 52nd Artillery Brigade (Russian Empire)
- 52nd Artillery Regiment "Torino"
- 52nd Aviation Regiment
- 52nd Aviation Regiment (United States)
- 52nd Battalion (Australia)
- 52nd Battalion (New Ontario), CEF
- 52nd Bombardment Squadron
- 52nd Brigade
- 52nd Cavalry Brigade (United States)
- 52nd Cavalry Division (Soviet Union)
- 52nd Combat Communications Squadron
- 52nd Corps (German Empire)
- 52nd Division
- 52nd Division (Imperial Japanese Army)
- 52nd Engineer Division (People's Republic of China)
- 52nd Expeditionary Flying Training Squadron
- 52nd Field Artillery Regiment "Torino"
- 52nd Fighter Squadron
- 52nd Fighter Wing
- 52nd Illinois Infantry Regiment
- 52nd Illinois Volunteer Infantry Regiment
- 52nd Indian Brigade
- 52nd Indiana Infantry Regiment
- 52nd Infantry Battalion (Cadre)
- 52nd Infantry Brigade (United Kingdom)
- 52nd Infantry Division "Torino"
- 52nd Infantry Division (German Empire)
- 52nd Infantry Division (Russian Empire)
- 52nd Infantry Division (South Korea)
- 52nd Infantry Division (Wehrmacht)
- 52nd Infantry Division Torino
- 52nd Infantry Regiment (United States)
- 52nd Kentucky Mounted Infantry Regiment
- 52nd Light Anti-Aircraft Brigade (United Kingdom)
- 52nd Lowland Volunteers
- 52nd Massachusetts Infantry Regiment
- 52nd Motorised Division Torino
- 52nd Mountain Motorized Infantry Brigade (People's Republic of China)
- 52nd New York Infantry Regiment
- 52nd New York Volunteer Infantry
- 52nd Ohio Infantry
- 52nd Ohio Infantry Regiment
- 52nd Ohio Volunteer Infantry Regiment
- 52nd Ordnance Group (EOD)
- 52nd Pennsylvania Infantry
- 52nd Pennsylvania Infantry Regiment
- 52nd Ranger Battalion (South Vietnam)
- 52nd Regiment
- 52nd Regiment Kentucky Volunteer Mounted Infantry
- 52nd Regiment of Foot (disambiguation)
- 52nd Reserve Division (German Empire)
- 52nd Rifle Corps
- 52nd Rifle Corps (Soviet Union)
- 52nd Rocket Division
- 52nd Sikhs (Frontier Force)
- 52nd Tennessee Infantry Regiment
- 52nd Troop Carrier Wing
- 52nd United States Colored Infantry
- 52nd United States Colored Infantry Regiment
- 52nd Virginia Infantry
- 52nd Virginia Infantry Regiment
- 52nd Wisconsin Infantry Regiment
- 52nd Wisconsin Volunteer Infantry Regiment
- 530th Air Defense Group
- 530th Air Force Band
- 530th Bombardment Squadron
- 530th Combat Crew Training Squadron
- 531st Bombardment Squadron
- 531st Fighter Squadron
- 531st Tactical Fighter Squadron
- 532d Training Squadron
- 532nd Engineer Boat and Shore Regiment
- 533d Air Defense Group
- 533d Training Squadron
- 533rd Training Squadron
- 534th Air Defense Group
- 534th Bombardment Squadron
- 534th Training Squadron
- 535th Airlift Squadron
- 535th Bombardment Squadron
- 536th Separate Coastal Missile and Artillery Brigade
- 536th Signal Battalion (United States)
- 536th Tactical Airlift Squadron
- 537th Airlift Squadron
- 538th Air Expeditionary Advisory Squadron
- 538th Fighter-Interceptor Squadron
- 538th Frontier Guard Division (Wehrmacht)
- 539 Assault Squadron RM
- 539 Raiding Squadron RM
- 539th Fighter-Interceptor Squadron
- 53T6
- 53 (Louisburg) Battery RA
- 53 (Wales & Western) Signal Squadron
- 53 Division (Sri Lanka)
- 53 Medium Regiment (India)
- 53d Airlift Squadron
- 53d Electronic Warfare Group
- 53d Fighter Squadron
- 53d Fighter Wing
- 53d Test and Evaluation Group
- 53d Weapons Evaluation Group
- 53d Weather Reconnaissance Squadron
- 53d Wing
- 53rd (Bolton) Field Regiment, Royal Artillery
- 53rd (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery
- 53rd (Shropshire) Regiment of Foot
- 53rd (Welsh) Infantry Division
- 53rd Airlift Squadron
- 53rd Alabama Cavalry Regiment
- 53rd Anti-Aircraft Brigade
- 53rd Anti-Aircraft Missile Brigade
- 53rd Anti-Aircraft Missile Regiment (Romania)
- 53rd Anti-Aircraft Rocket Brigade
- 53rd Armoured Regiment (India)
- 53rd Army (Soviet Union)
- 53rd Battalion
- 53rd Battalion (Australia)
- 53rd Battalion (Northern Saskatchewan), CEF
- 53rd Brigade
- 53rd Brigade (United Kingdom)
- 53rd Coast Artillery Regiment
- 53rd Corps (German Empire)
- 53rd Division
- 53rd Division (1st Formation)(People's Republic of China)
- 53rd Division (1st Formation) (People's Republic of China)
- 53rd Division (Imperial Japanese Army)
- 53rd Electronic Warfare Group
- 53rd Fighter Squadron
- 53rd Fighter Squadron "Warhawks"
- 53rd Fighter Wing
- 53rd Illinois Infantry Regiment
- 53rd Illinois Volunteer Infantry Regiment
- 53rd Indian Brigade
- 53rd Indian Infantry Brigade
- 53rd Indiana Infantry Regiment
- 53rd Infantry Brigade
- 53rd Infantry Brigade Combat Team (United States)
- 53rd Infantry Division "Arezzo"
- 53rd Infantry Division (France)
- 53rd Infantry Division (Russian Empire)
- 53rd Infantry Division Arezzo
- 53rd Infantry Regiment (Imperial Japanese Army)
- 53rd Infantry Regiment (United States)
- 53rd Kentucky Mounted Infantry Regiment
- 53rd Massachusetts Infantry Regiment
- 53rd Massachusetts Volunteer Infantry Regiment
- 53rd Mechanized Brigade (Ukraine)
- 53rd Mountain Motorized Infantry Brigade (People's Republic of China)
- 53rd Munich Security Conference
- 53rd New York Infantry Regiment
- 53rd New York Volunteer Infantry
- 53rd Ohio Infantry
- 53rd Ohio Infantry Regiment
- 53rd Pennsylvania Infantry
- 53rd Pennsylvania Infantry Regiment
- 53rd Regiment
- 53rd Regiment Alabama Cavalry
- 53rd Regiment Kentucky Volunteer Mounted Infantry
- 53rd Regiment Massachusetts Volunteer Infantry
- 53rd Regiment of Foot (disambiguation)
- 53rd Reserve Division (German Empire)
- 53rd Rifle Corps
- 53rd Rifle Corps (Soviet Union)
- 53rd Rifle Division (Soviet Union)
- 53rd Rocket Army
- 53rd Satellite Operations Squadron
- 53rd Signal Battalion
- 53rd Sikhs (Frontier Force)
- 53rd Space Operations Squadron
- 53rd Test and Evaluation Group
- 53rd Transportation Battalion
- 53rd Troop Command
- 53rd United States Colored Infantry
- 53rd United States Colored Infantry Regiment
- 53rd Virginia Infantry
- 53rd Virginia Infantry Regiment
- 53rd Wisconsin Infantry Regiment
- 53rd Wisconsin Volunteer Infantry Regiment
- 540th Aircraft Control and Warning Group
- 540th Combat Crew Training Wing
- 541st Aircraft Control and Warning Group
- 541st Bombardment Squadron
- 541st Coast Regiment, Royal Artillery
- 541st Parachute Infantry Regiment (United States)
- 541st Volksgrenadier Division
- 541st Volksgrenadier Division (Wehrmacht)
- 542d Aircraft Control and Warning Group
- 542d Combat Sustainment Wing
- 542nd Aircraft Control and Warning Group
- 542nd Combat Sustainment Wing
- 542nd Grenadier Division
- 542nd Grenadier Division (Wehrmacht)
- 542nd Parachute Infantry Regiment (United States)
- 543d Aircraft Control and Warning Group
- 543d Bombardment Squadron
- 543d Intelligence, Surveillance and Reconnaissance Group
- 543d Tactical Support Group
- 543rd Intelligence, Surveillance and Reconnaissance Group
- 544th Aircraft Control and Warning Group
- 544th Bombardment Squadron
- 544th Fighter Squadron
- 544th Intelligence, Surveillance and Reconnaissance Group
- 544th Volksgrenadier Division
- 544th Volksgrenadier Division (Wehrmacht)
- 545th Aircraft Control and Warning Group
- 545th Bombardment Squadron
- 545th Brigade Engineer Battalion
- 545th Fighter Squadron
- 545th Test Group
- 546th Aircraft Control and Warning Group
- 546th Bombardment Squadron
- 546th Fighter Squadron
- 547th Bombardment Squadron
- 547th Intelligence Squadron
- 548th Combat Training Squadron
- 548th Grenadier Division
- 548th Intelligence, Surveillance and Reconnaissance Group
- 548th Strategic Missile Squadron
- 548th Volksgrenadier Division
- 549th Combat Training Squadron
- 549th Electrical and Mechanical Company, Royal Engineers
- 549th Engineer Light Ponton Company
- 549th Engineer Light Pontoon Company
- 549th Strategic Missile Squadron
- 549th Volksgrenadier Division
- 54 Air-Sea Rescue Marine Craft Unit RAF
- 54 Division (Sri Lanka)
- 54 Field Regiment (India)
- 54 Squadron
- 54th (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery
- 54th (East Anglian) Infantry Division
- 54th (West Norfolk) Regiment of Foot
- 54th Air Defense Corps
- 54th Air Refueling Squadron
- 54th Airlift Squadron
- 54th Anti-Aircraft Brigade (United Kingdom)
- 54th Armoured Regiment (India)
- 54th Army (People's Republic of China)
- 54th Army (Soviet Union)
- 54th Battalion (Australia)
- 54th Battalion (Kootenay), CEF
- 54th Bombardment Squadron
- 54th Brigade
- 54th Corps (German Empire)
- 54th Division
- 54th Division (Imperial Japanese Army)
- 54th Division (People's Republic of China)
- 54th Division (Spain)
- 54th Engineer Battalion (United States)
- 54th Fighter Group
- 54th Fighter Squadron
- 54th Group Army
- 54th Guards Fighter Aviation Regiment
- 54th Guards Rifle Division
- 54th Guards Rocket Division
- 54th Helicopter Squadron
- 54th Illinois Infantry Regiment
- 54th Illinois Volunteer Infantry Regiment
- 54th Indian Brigade
- 54th Indiana Infantry Regiment
- 54th Infantry
- 54th Infantry Brigade (United Kingdom)
- 54th Infantry Division
- 54th Infantry Division "Napoli"
- 54th Infantry Division (German Empire)
- 54th Infantry Division (India)
- 54th Infantry Division (Russian Empire)
- 54th Infantry Division Napoli
- 54th Infantry Regiment
- 54th Infantry Regiment (France)
- 54th Infantry Regiment (Imperial Japanese Army)
- 54th Infantry Regiment (United States)
- 54th Kentucky Mounted Infantry Regiment
- 54th Massachusetts Infantry Regiment
- 54th Massachusetts Volunteer Infantry Regiment
- 54th Massachusetts Volunteer Regiment
- 54th Mechanized Brigade (Ukraine)
- 54th New York Infantry Regiment
- 54th New York Volunteer Infantry
- 54th Ohio Infantry
- 54th Ohio Infantry Regiment
- 54th Pennsylvania Infantry Regiment
- 54th Regiment Kentucky Volunteer Mounted Infantry
- 54th Regiment Massachusetts Volunteer Infantry
- 54th Regiment Ohio Volunteer Infantry
- 54th Regiment United States Colored Infantry