The Twentieth Air Force (Air Forces Strategic) (20th AF) is a numbered air force of the United States Air Force Global Strike Command (AFGSC). It is headquartered at Francis E. Warren Air Force Base, Wyoming. 20 AF's primary mission is Intercontinental Ballistic Missile (ICBM) operations. The Twentieth Air Force commander is also the Commander, Task Force 214 (TF 214), which provides alert ICBMs to the United States Strategic Command (USSTRATCOM). Established on 4 April 1944 at Washington D.C, 20 AF was a United States Army Air Forces combat air force deployed to the Pacific Theater of World War II. Operating initially from bases in India and staging through bases in China, 20 AF conducted strategic bombardment of the Japanese Home Islands. It relocated to the Mariana Islands in late 1944, and continued the strategic bombardment campaign against Japan until the Japanese capitulation in August 1945. The 20 AF 509th Composite Group conducted the atomic attacks on Hiroshima and Nagasaki in August 1945, and remains as the only air force organization to have used a nuclear weapon in combat. Inactivated on 1 March 1955, the command was reactivated 1 September 1991, as a component of the Strategic Air Command (SAC) and became operationally responsible for all land-based Intercontinental Ballistic Missiles. Overview Twentieth Air Force headquarters is unique in that it has dual responsibilities to Air Force Global Strike Command and United States Strategic Command. As the missile Numbered Air Force for AFGSC, 20th Air Force is responsible for maintaining and operating the Air Force's ICBM force. Designated as STRATCOM's Task Force 214, 20th Air Force provides on-alert, combat ready ICBMs to the president. Combined with the other two legs of the Triad, bombers and submarines, STRATCOM forces protect the United States with an umbrella of deterrence. Organization Headquarters, Francis E. Warren AFB, Wyoming 90th Missile Wing, Francis E. Warren AFB, Wyoming 319th Missile Squadron 320th Missile Squadron 321st Missile Squadron 91st Missile Wing, Minot AFB, Minot, North Dakota 740th Missile Squadron 741st Missile Squadron 742nd Missile Squadron 341st Missile Wing, Malmstrom AFB, Montana 10th Missile Squadron 12th Missile Squadron 490th Missile Squadron 582nd Helicopter Group, Francis E. Warren AFB, Wyoming 582nd Operations Support Squadron 37th Helicopter Squadron 40th Helicopter Squadron 54th Helicopter Squadron 377th Air Base Wing – Kirtland AFB, New Mexico 625th Strategic Operations Squadron – Offutt AFB, Nebraska History The Twentieth Air Force was brought into existence on 4