sentences:  173rd Surveillance Squadron, based at Oakey, was the last operator of fixed-wing aircraft, using three Beechcraft B300 King Air 350s in Command and Control, Surveillance, and Transport roles.Other aircraft types operated were the Pilatus Porter, the GAF Nomad and the de Havilland Canada DHC-6 Twin Otter.The Bell 206B-1 Kiowa (1972-2019) was primarily employed for airborne observation and flying training.