Torrejón Air Base (Base Aérea de Torrejón de Ardoz) is both a major Spanish Air and Space Force base and the co-located Madrid–Torrejón Airport, a secondary civilian airport for the city and metropolitan area of Madrid, east-northeast of the city center in central Spain. History Torrejón Air Base was originally the home of the Spanish National Institute of Aeronautics, however following the Pact of Madrid of 26 September 1953, construction began at Torrejón on a new concrete runway to replace the existing grass airstrip and on a massive concrete apron and other necessary maintenance and shelter facilities to accommodate the largest United States Air Force (USAF) bomber aircraft in the Strategic Air Command (SAC) inventory, with the base intended to support SAC Reflex missions. This was the longest runway in Europe until the construction of the Ulyanovsk Vostochny Airport in 1983, and is the ninth longest runway in Europe as of 1 June 2017. USAF support activities began under the 7600th Air Base Group located in Madrid in July 1956, to support construction and base organizational functions. Torrejón Air Base opened officially on 1 June 1957 with SAC activating the 3970th Strategic Wing on 1 July 1957. The base hosting Sixteenth Air Force as well as SAC's 65th Air Division (Defense) where it cooperated with Spanish Air Force units in the Air Defense Direction Centers (ADDC). The 65th Air Division directed base construction and the establishment of off-base housing and radar sites. The division's fighter squadrons flew air defense interceptions over Spanish airspace. The division also controlled the operations of numerous attached tactical fighter squadrons that were deployed to Spain for temporary duty (TDY). Assigned or attached units of the division participated in numerous exercises with the Spanish Air Defense Command, and in some instances, with the U.S. Sixth Fleet. In addition to the command and control mission, Torrejón Air Base hosted SAC reflex operations. Reflex operations consisted of rotating B-47 Stratojet wings overseas for extended duty as part of a dispersal program. Another reason for establishing Reflex bases was the relatively short range of the B-47, unlike the intercontinental range of the B-36 Peacemaker and B-52 Stratofortress which could remain based permanently in the United States. Also, in this way SAC could spread out its potential as a Soviet target by placing its aircraft, weapons, and personnel on many more bases, with each bombardment wing having two additional installations