An Air National Guard base in Oklahoma will host the first formal training unit for the service's armed recon crop duster plane used for special operations , an announcement that comes as watchdogs question the aircraft's future in combat. In a ceremony last week, Will Rogers Air National Guard Base in Oklahoma City announced it would become home to Air Force Special Operations Command's newest aircraft, the OA-1K Sky Warden, an armed single-engine aircraft modified from an Air Tractor frame