After elementary training, aircrews streamed to fly multi-engine aircraft and rear-seat roles are trained by No. 45(R) Squadron, which operate five Embraer Phenom 100. On 16 January 2018, the Skyes Building was opened at Cranwell by Air Marshal Sean Reynolds, the Deputy Commander Capability and Senior Responsible Owner of the UKMFTS. The building acts as a UKMFTS operational support building and is used to train new RAF pilots. It was named after Air-Vice Marshal Sir Frederick Hugh Sykes, a British military officer and politician who served during the First World War. Since the mid-1990s, Cranwell has been home to Headquarters, Air Cadets, and the Air Cadet Organisation's Adult Training Facility. The following notable flying and non-flying units are based at RAF Cranwell.