The Beechcraft T-6 Texan II is a single-engined turboprop aircraft built by the Raytheon Aircraft Company (which became Hawker Beechcraft and is now Beechcraft Corporation). Based on the Pilatus PC-9, the T-6A is used by the United States Air Force for basic pilot training and by the United States Navy for Primary and Intermediate Joint Naval Flight Officer (NFO) and Air Force Combat Systems Officer (CSO) training. It has replaced the Air Force's T-37B Tweet and is replacing the Navy's T-34C Turbo Mentor. The T-6A is also used as a basic trainer by the Royal Canadian Air Force (CT-156 Harvard II), the German Air Force, the Greek Air Force, the Israeli Air Force (Efroni), and the Iraqi Air Force. The T-6C is used for training by the Royal Moroccan Air Force and the Mexican Air Force.