Sioux City Air National Guard Base - An air-to-air view of three Vought A-7D Corsair II aircraft in formation during Exercise TEAM SPIRIT'86 on 1 March 1986. The aircraft belonged to the 185th Tactical Fighter Group, Iowa Air National Guard, based at Sioux Gateway Airport in Sioux City, Iowa (USA), which flew the A-7D from 1977 to 1992.