sentences:  During the late 1960s, Bristow Helicopters operated a fleet of Hiller UH-12 training helicopters based at AAC Middle Wallop which were used to train flight crews on behalf of the UK Army Air Corps.In 1986, the company began training overseas pilots at its flying school at Redhill Aerodrome; this program ran for multiple decades, being rebranded as the "Bristow Academy".In addition to pilot training, Bristow has also been involved in training ground crew, having started sponsoring students at the Nigerian College of Aviation Technology, (NCAT), Zaria, in 1986.