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30th Launch Group30th Light Dragoons30th Maine Volunteer Infantry Regiment
30th Mechanized Brigade (Ukraine)30th Mechanized Corps (Soviet Union)30th Mechanized Infantry Brigade (Greece)
30th Michigan Volunteer Infantry Regiment30th Missouri Volunteer Infantry30th New York Volunteer Infantry Regiment
30th Ohio Infantry30th Operations Group30th Punjabis
30th Reconnaissance Squadron30th Reconnaissance Squadron (disambiguation)30th Regiment Kentucky Volunteer Mounted Infantry
30th Regiment Massachusetts Volunteer Infantry30th Rifle Division30th Separate Company Armory
30th Space Wing30th Tactical Missile Squadron30th Tactical Reconnaissance Squadron
30th U-boat Flotilla30th United States Colored Infantry30th Virginia Infantry
30th Virginia Sharpshooters Battalion30th Waffen Grenadier Division of the SS30th Weather Squadron
30th Wisconsin Volunteer Infantry Regiment310th310th Air Division
310th Air Refueling Squadron310th Airlift Squadron310th Armored Cavalry Regiment
310th Artillery Division (Wehrmacht)310th Cavalry Regiment (United States)310th Fighter Squadron
310th Rifle Division (Soviet Union)310th Space Wing311 Squadron
311th Air Base Group311th Air Division311th Airlift Squadron
311th Armored Cavalry Regiment311th Cavalry Regiment (United States)311th Fighter Squadron
311th Human Systems Wing311th Rifle Division (Soviet Union)311th Signal Command (United States)
311th Sustainment Command (Expeditionary)312th Aeronautical Systems Group312th Airlift Squadron
312th Cavalry Regiment (United States)312th Division (Vietnam)312th Fighter Wing
312th Independent Infantry Battalion (Imperial Japanese Army)312th Rifle Division (Soviet Union)312th Tactical Fighter Training Squadron
312th Tactical Fighter Wing313th Air Division313th Air Expeditionary Wing
313th Airlift Squadron313th Bombardment Squadron313th Cavalry Regiment (United States)
313th Expeditionary Operations Group313th Military Intelligence Battalion (United States)313th Rifle Division (Soviet Union)
313th Signal Company (United States Army)313th Tactical Airlift Group313th Tactical Airlift Wing
313th Tactical Fighter Squadron314th Air Division314th Air Refueling Squadron
314th Airlift Wing314th Armored Cavalry Regiment314th Bombardment Squadron
314th Cavalry Regiment (United States)314th Fighter Squadron314th Infantry Regiment (United States)
314th Operations Group314th Rifle Division (Soviet Union)315th Air Division
315th Airlift Wing315th Bombardment Squadron315th Cavalry Regiment (United States)
315th Cyberspace Operations Squadron315th Engineer Battalion (United States)315th Fighter Squadron
315th Network Warfare Squadron315th Operations Group315th Rifle Division (Soviet Union)
315th Troop Carrier Squadron315th Weapons Squadron316th Air Division
316th Bombardment Squadron316th Cavalry Brigade316th Cavalry Regiment (United States)
316th Division316th Division (Vietnam)316th Fighter Squadron
316th Infantry Division316th Operations Group316th Rifle Division (Soviet Union)
316th Sustainment Command (Expeditionary)316th Troop Carrier Squadron316th Wing
316th division317th Airlift Group317th Airlift Squadron
317th Armored Cavalry Regiment317th Bombardment Squadron317th Cavalry Regiment (United States)
317th Fighter-Interceptor Squadron317th Infantry Regiment (United States)317th Operations Group
317th Rifle Division (Soviet Union)317th Troop Carrier Group318th Cavalry Regiment (United States)
318th Cyberspace Operations Group318th Fighter-Interceptor Squadron318th Fighter Group
318th Fighter Interceptor Squadron318th Infantry Regiment (United States)318th Information Operations Group
318th Operations Support Squadron318th Rifle Division (Soviet Union)318th Special Operations Squadron
319th Air Base Wing319th Cavalry Regiment (United States)319th Division
319th Division (IDF)319th Explosive Ordnance Disposal Company319th Field Artillery Regiment
319th Field Artillery Regiment (United States)319th Fighter Interceptor Training Squadron319th Military Intelligence Battalion (United States)
319th Missile Squadron319th Operations Group319th Rifle Division (Soviet Union)
319th Special Operations Squadron319th Static Infantry Division (Wehrmacht)31 (City of London) Signal Regiment
31 (London, Windsor, Hamilton) Service Battalion31 Battalion (SWATF)31 Canadian Brigade Group
31 Combat Engineer Regiment (The Elgins)31 March Incident31 Service Battalion
31 Squadron31 Squadron SAAF31e Escadre Aérienne de Ravitaillement et de Transport Stratégiques
31st/42nd Battalion, Royal Queensland Regiment31st/51st Battalion (Australia)31st (Alberta) Battalion, CEF
31st (Huntingdonshire) Regiment of Foot31st (North Midland) Anti-Aircraft Brigade31st Air Base
31st Air Defense Artillery Brigade (United States)31st Air Division31st Airborne Battalion (Sweden)
31st Airborne Brigade (Bundeswehr)31st Airlift Squadron31st Arkansas Infantry Regiment
31st Armoured Brigade31st Army31st Army (People's Republic of China)
31st Army (Soviet Union)31st Army Corps (Russian Empire)31st Artillery Division (People's Republic of China)
31st Ashura Division31st Battalion31st Battalion, Royal Queensland Regiment
31st Battalion (Alberta), CEF31st Brigade31st Brigade (Australia)
31st Brigade (France)31st Brigade (United Kingdom)31st Cavalry
31st Cavalry Regiment31st Cavalry Regiment (United States)31st Civil Support Team (WMD)
31st Combat Communications Squadron31st Division31st Division (German Empire)
31st Division (Imperial Japanese Army)31st Division (Philippines)31st Division (United Kingdom)
31st Engineer Battalion31st Field Artillery Regiment
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