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53rd Anti-Aircraft Missile Brigade53rd Anti-Aircraft Missile Regiment (Romania)53rd Anti-Aircraft Rocket Brigade
53rd Army (Soviet Union)53rd Battalion (Australia)53rd Battalion (Northern Saskatchewan), CEF
53rd Brigade53rd Brigade (United Kingdom)53rd Coast Artillery Regiment
53rd Coast Artillery Regiment (United States)53rd Corps (German Empire)53rd Division
53rd Division (1st Formation)(People's Republic of China)53rd Division (Imperial Japanese Army)53rd Illinois Infantry Regiment
53rd Illinois Volunteer Infantry Regiment53rd Indian Brigade53rd Indian Infantry Brigade
53rd Indiana Infantry Regiment53rd Infantry Brigade53rd Infantry Brigade Combat Team (United States)
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 Mechanized Brigade (Ukraine)
53rd Mountain Motorized Infantry Brigade (People's Republic of China)53rd Ohio Infantry53rd Pennsylvania Infantry
53rd Pennsylvania Infantry Regiment53rd Regiment53rd Regiment Alabama Cavalry
53rd Regiment Kentucky Volunteer Mounted Infantry53rd 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 Battalion53rd Troop Command53rd United States Colored Infantry
53rd Virginia Infantry53rd Wisconsin Volunteer Infantry Regiment540th Aircraft Control and Warning Group
540th Combat Crew Training Wing541st Aircraft Control and Warning Group541st Bombardment Squadron
541st Parachute Infantry Regiment (United States)542d Aircraft Control and Warning Group542d Combat Sustainment Wing
542nd Grenadier Division (Wehrmacht)542nd Parachute Infantry Regiment (United States)543d Aircraft Control and Warning Group
543d Bombardment Squadron543d Intelligence, Surveillance and Reconnaissance Group543d Tactical Support Group
544th Aircraft Control and Warning Group544th Bombardment Squadron544th Fighter Squadron
544th Intelligence, Surveillance and Reconnaissance Group545th Aircraft Control and Warning Group545th Bombardment Squadron
545th Fighter Squadron546th Aircraft Control and Warning Group546th Bombardment Squadron
546th Fighter Squadron547th Bombardment Squadron547th Intelligence Squadron
548th Combat Training Squadron548th Intelligence, Surveillance and Reconnaissance Group548th Strategic Missile Squadron
549th Combat Training Squadron549th Electrical and Mechanical Company, Royal Engineers549th Engineer Light Ponton Company
549th Strategic Missile Squadron54 Division (Sri Lanka)54th (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery
54th (East Anglian) Infantry Division54th (West Norfolk) Regiment of Foot54th Air Defense Corps
54th Air Refueling Squadron54th Airlift Squadron54th Anti-Aircraft Brigade (United Kingdom)
54th Army (People's Republic of China)54th Army (Soviet Union)54th Battalion (Australia)
54th Battalion (Kootenay), CEF54th Bombardment Squadron54th Brigade
54th Corps (German Empire)54th Division54th Division (Imperial Japanese Army)
54th Division (People's Republic of China)54th Engineer Battalion (United States)54th Fighter Group
54th Fighter Squadron54th Group Army54th Guards Fighter Aviation Regiment
54th Guards Rifle Division54th Guards Rocket Division54th Helicopter Squadron
54th Illinois Infantry Regiment54th Illinois Volunteer Infantry Regiment54th Indian Brigade
54th Indiana Infantry Regiment54th Infantry54th Infantry Brigade (United Kingdom)
54th Infantry Division (German Empire)54th Infantry Division (Russian Empire)54th Infantry Division Napoli
54th Infantry Regiment54th Infantry Regiment (France)54th Infantry Regiment (Imperial Japanese Army)
54th Infantry Regiment (United States)54th Massachusetts Infantry Regiment54th Massachusetts Volunteer Regiment
54th Mechanized Brigade (Ukraine)54th New York Volunteer Infantry54th Ohio Infantry
54th Pennsylvania Infantry54th Pennsylvania Infantry Regiment54th Regiment Kentucky Volunteer Mounted Infantry
54th Regiment Massachusetts Volunteer Infantry54th 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 Wing54th United States Colored Infantry54th Virginia Infantry
54th Weather Reconnaissance Squadron550th Airborne Infantry Battalion (United States)550th Fighter Squadron
550th Guided Missiles Wing550th Special Operations Squadron550th Strategic Missile Squadron
551st Electronic Systems Wing551st Parachute Infantry Battalion (United States)551st Signal Battalion (United States)
551st Special Operations Squadron551st Strategic Missile Squadron551st United States Air Force Hospital
552 Squadron (Portugal)552d Air Control Wing552d Fighter-Bomber Squadron
553d Fighter-Bomber Squadron553d Reconnaissance Squadron553rd Reconnaissance Squadron
554th Electronic Systems Wing554th Engineer Battalion (United States)554th Fighter-Bomber Squadron
554th Reconnaissance Squadron555 AMU Specialist Section555th Anti-Aircraft Rocket Regiment
555th Engineer Brigade (United States)555th Fighter Squadron555th Parachute Infantry Battalion (United States)
556th Strategic Missile Squadron556th Test and Evaluation Squadron557th Flying Training Squadron
557th Moonlight Battery, Royal Artillery557th Weather Wing558th Flying Training Squadron
559th Bombardment Squadron559th Flying Training Squadron55 Day War
55 Division (Sri Lanka)55 S 5555th/53rd Battalion (Australia)
55th (Kent) Heavy Anti-Aircraft Regiment, Royal Artillery55th (New Brunswick & Prince Edward Island) Battalion, CEF55th (West Lancashire) Infantry Division
55th (Westmorland) Regiment of Foot55th Air Defense Artillery Regiment55th Air Defense Artillery Regiment (United States)
55th Air Refueling Squadron55th Airborne Brigade55th Airlift Flight
55th Army (Soviet Union)55th Artillery Brigade (Ukraine)55th Battalion (Australia)
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