Ca.1971: TOS USAF as A-37B. Ca. 1980: Redesignated OA-37B. By 10/83: 23rd Tactical Air Support Squadron/602nd Tactical Air Control Wing, Bergstrom AFB, TX. By 7/88 to 1992: 169th Tactical Air Support Squadron/182nd Tactical Air Support Group (ANG), Peoria, IL. 1997: TOS Ecuadoran Air Force as FAE-368. 2/11: WFU. By 10/14: Aeronautics Superior Technical Institute, Latacunga, Ecuador.