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3 Signals Squadron Royal New Zealand Corps of Signals3 South African Infantry Battalion3 Squadron
3 Squadron SAAF3 mm caliber3 pounder gun
3d Air Division3d Air Support Operations Group3d Air Support Operations Squadron
3d Airlift Squadron3d Arkansas Infantry Regiment (Confederate States)3d Armored Cavalry Regiment
3d Armored Cavalry Squadron (South Vietnam)3d Bombardment Squadron3d Cavalry Regiment (United States)
3d Combat Communications Group3d Command and Control Squadron3d Fighter Squadron (Commando)
3d Flying Training Squadron3d Light Antiaircraft Missile Battalion3d Mississippi Cavalry Regiment
3d Operations Group3d Pursuit Group3d Reconnaissance Group
3d Reconnaissance Squadron3d Search Attack Squadron3d Space Communications Squadron
3d Space Experimentation Squadron3d Space Operations Squadron3d Space Wing
3d Special Operations Squadron3d Transportation Support Battalion3d Troop Carrier Squadron
3d Weather Squadron3d Wing3e Escadre de Chasse
3rd/4th Cavalry Regiment (Australia)3rd/4th County of London Yeomanry (Sharpshooters)3rd/5th Battalion Lancashire Fusiliers
3rd/9th Light Horse (South Australian Mounted Rifles)3rd (Ambala) Cavalry Brigade3rd (Auckland) Mounted Rifles
3rd (Black Watch) Battalion The Royal Regiment of Scotland3rd (City of London) Battalion, London Regiment3rd (East Prussian) Cuirassiers "Count Wrangel"
3rd (Lahore) Division3rd (Meerut) Cavalry Brigade3rd (Royal Marine) Brigade
3rd (Royal Northumberland Fusiliers) Reconnaissance Regiment3rd (United Kingdom) Division3rd Air Army
3rd Air Command3rd Air Defense Artillery Regiment3rd Air Defense Artillery Regiment (United States)
3rd Air Defense Composite Brigade (People's Republic of China)3rd Air Reconnaissance Regiment3rd Airborne Corps (Soviet Union)
3rd Aircraft Carrier Squadron3rd Alabama Infantry Regiment (Colored)3rd Alabama Volunteer Infantry Regiment (African Descent)
3rd Algerian Infantry Division3rd Algerian Tirailleurs Regiment3rd Alpine Division Julia
3rd Alpine Group3rd Alpini Regiment3rd Anti-Aircraft Artillery Division (Soviet Union)
3rd Anti-Aircraft Brigade (United Kingdom)3rd Anti-Aircraft Division (United Kingdom)3rd Arkansas Cavalry
3rd Arkansas Cavalry Regiment3rd Arkansas Cavalry Regiment (Union)3rd Arkansas Consolidated Infantry Regiment
3rd Arkansas Field Battery3rd Arkansas Infantry Regiment3rd Arkansas Infantry Regiment (Union)
3rd Arkansas Light Artillery3rd Armored Brigade (People's Republic of China)3rd Armored Division (France)
3rd Armored Division (Jordan)3rd Armored Division (United States)3rd Armored Division Artillery (United States)
3rd Armoured Brigade (Bundeswehr)3rd Armoured Brigade (United Kingdom)3rd Armoured Close Support Battalion Corps of Royal Electrical and Mechanical Engineers
3rd Armoured Division (Australia)3rd Armoured Division (Syria)3rd Armoured Personnel Carrier Squadron
3rd Army (Austria-Hungary)3rd Army (France)3rd Army (German Empire)
3rd Army (Kingdom of Yugoslavia)3rd Army (RSFSR)3rd Army (Russian Empire)
3rd Army (Soviet Union)3rd Army (Wehrmacht)3rd Army (Yugoslavia)
3rd Army Aviation Command3rd Army Aviation Regiment (Ukraine)3rd Army Corps
3rd Army Corps (Armed Forces of South Russia)3rd Army Corps (France)3rd Army Corps (Italy)
3rd Army Corps (Russian Empire)3rd Army Corps (VSUR)3rd Army Division (Argentina)
3rd Army Division (Sweden)3rd Army Group (France)3rd Army Group (Kingdom of Yugoslavia)
3rd Army Group (Yugoslavia)3rd Army Tank Brigade (Australia)3rd Artillery Regiment
3rd Assault Amphibian Battalion3rd Australian Field Ambulance3rd Australian Tunnelling Company
3rd Aviation Corps3rd Aviation Regiment3rd Aviation Regiment (United States)
3rd Baltic Front3rd Battalion3rd Battalion, 10th Marines
3rd Battalion, 11th Marines3rd Battalion, 12th Marines3rd Battalion, 14th Marines
3rd Battalion, 153rd Infantry Regiment3rd Battalion, 16th Field Artillery Regiment3rd Battalion, 187th Infantry Regiment
3rd Battalion, 23rd Marines3rd Battalion, 25th Marines3rd Battalion, 26th Marines
3rd Battalion, 28th Marines3rd Battalion, 29th Field Artillery Regiment (United States)3rd Battalion, 2nd Marines
3rd Battalion, 319th Field Artillery Regiment3rd Battalion, 320th Field Artillery Regiment3rd Battalion, 321st Field Artillery Regiment
3rd Battalion, 4th Marines3rd Battalion, 69th Armor Regiment3rd Battalion, 6th Marines
3rd Battalion, 8th Marines3rd Battalion, Parachute Regiment3rd Battalion, Royal Anglian Regiment
3rd Battalion, Royal Australian Regiment3rd Battalion, The Royal Canadian Regiment3rd Battalion, Ulster Defence Regiment
3rd Battalion (Australia)3rd Battalion (Toronto Regiment), CEF3rd Battalion 10th Marines
3rd Battalion 11th Marines3rd Battalion 12th Marines3rd Battalion 14th Marines
3rd Battalion 16th Field Artillery Regiment (United States)3rd Battalion 1st Marines3rd Battalion 23rd Marines
3rd Battalion 24th Marines3rd Battalion 25th Marines3rd Battalion 28th Marines
3rd Battalion 29th Field Artillery Regiment (United States)3rd Battalion 2nd Marines3rd Battalion 3rd Marines
3rd Battalion 4th Marines3rd Battalion 5th Marines3rd Battalion 6th Marines
3rd Battalion 7th Marines3rd Battalion 8th Marines3rd Battalion 9th Marines
3rd Battalion The Mercian Regiment
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