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401 Squadron401 Squadron (Portugal)401 Tactical Fighter Squadron
401st401st Air Expeditionary Group401st Army Field Support Brigade
401st Brigade (IDF)401st Fighter Squadron401st Tactical Airlift Squadron (JASDF)
4028th Strategic Reconnaissance Squadron402 Squadron402 Squadron RCAF
402d Fighter-Day Group402d Fighter Squadron402d Maintenance Wing
402nd402nd Field Artillery Brigade (United States)402nd Support Brigade (United States)
402nd Tactical Airlift Squadron (JASDF)403 Battle Group (Bangladesh)403 Helicopter Operational Training Squadron
403d Army Field Support Brigade403d Bombardment Squadron403d Operations Group
403d Wing403rd403rd Army Field Support Brigade
403rd Infantry Brigade403rd Tactical Airlift Squadron (JASDF)404 Maritime Patrol and Training Squadron
404th404th Air Expeditionary Group404th Maneuver Enhancement Brigade
404th Rifle Division (Soviet Union)404th Tactical Airlift Tanker Squadron (JASDF)405 Maritime Patrol Squadron
405th405th (SHAHIN) Transport Battalion (Reserve)405th Air Expeditionary Group
405th Air Expeditionary Operations Group405th Air Expeditionary Wing405th Tactical Missile Squadron
406 Maritime Operational Training Squadron406th406th Air Expeditionary Group
406th Air Expeditionary Operations Group406th Air Expeditionary Wing406th Support Brigade (United States)
407 Long Range Patrol Squadron407th407th Air Expeditionary Group
407th Air Refueling Squadron407th Brigade Support Battalion407th Forward Support Battalion
407th Military Hospital (Ukraine)407th Support Brigade (United States)4080th Strategic Reconnaissance Wing
4081st Strategic Wing4083d Strategic Wing408 (Fleet Fighter) Flight
408 Tactical Helicopter Squadron408th408th Armament Systems Group
408th Bombardment Squadron408th Rifle Division (Soviet Union)409 (Fleet Fighter) Flight
409 Tactical Fighter Squadron409th409th Air Expeditionary Operations Group
409th Rifle Division40M Nimród40M Turán
40M Turán I40 (Ulster) Signal Regiment40 Commando
40 Squadron40 Squadron SAAF40 cm/45 Type 94 naval gun
40mm grenade40th/41st Royal Tank Regiment40th (The King's) Royal Tank Regiment
40th (the 2nd Somersetshire) Regiment of Foot40th Aerospace Rescue and Recovery Squadron40th Air Division
40th Air Expeditionary Wing40th Air Refueling Squadron40th Airlift Squadron
40th Anti-Aircraft Artillery Division (Soviet Union)40th Anti-Aircraft Brigade (United Kingdom)40th Armored Division (United States)
40th Army (People's Republic of China)40th Army (Soviet Union)40th Army Corps (Russian Empire)
40th Artillery Brigade (Ukraine)40th Battalion40th Battalion (Australia)
40th Battalion (Nova Scotia), CEF40th Battalion Virginia Cavalry40th Brigade
40th Brigade (United Kingdom)40th Brigade Royal Field Artillery40th Cavalry Regiment (United States)
40th Division40th Division (German Empire)40th Division (Imperial Japanese Army)
40th Division (United Kingdom)40th Engineer Regiment (United Kingdom)40th Expeditionary Bomb Squadron
40th Field Artillery Regiment40th Field Artillery Regiment (United States)40th Fighter Aviation Regiment
40th Flight Test Squadron40th Group Army40th Guards Rifle Division
40th Helicopter Squadron40th Illinois Infantry Regiment40th Illinois Volunteer Infantry Regiment
40th Indian Infantry Brigade40th Indiana Infantry Regiment40th Infantry Brigade Combat Team (United States)
40th Infantry Division (Russian Empire)40th Infantry Division (United States)40th Infantry Division Cacciatori d'Africa
40th Infantry Division Slavonska40th Infantry Regiment (United States)40th Iowa Volunteer Infantry Regiment
40th Massachusetts Volunteer Infantry40th Military Airlift Squadron40th Motorized Infantry Battalion (Ukraine)
40th Naval Infantry Brigade40th New Jersey Volunteer Infantry40th New York Volunteer Infantry Regiment
40th Ohio Infantry40th Pathans40th Regiment
40th Regiment Kentucky Volunteer Infantry40th Regiment Royal Artillery40th Regiment of Foot
40th Rifle Division (Soviet Union)40th Squadron Heli (Belgium)40th Tactical Squadron
40th United States Colored Infantry40th Virginia Infantry40th Wisconsin Volunteer Infantry Regiment
41-foot Utility Boat, Large410 Tactical Fighter Operational Training Squadron410th
410th Air Expeditionary Wing410th Bombardment Squadron410th Expeditionary Operations Group
410th Flight Test Squadron410th Support Brigade (United States)411th
411th Bombardment Group411th Civil Affairs Battalion (United States)411th Engineer Brigade (United States)
411th Engineering Group of Borujerd411th Flight Test Squadron411th Rifle Division (Soviet Union)
411th Support Brigade (United States)412 Transport Squadron412th
412th Aviation Support Battalion
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