sentences:  Since November 2009 the Army's air assets are composed exclusively of rotary-wing aircraft (helicopters), the Royal Australian Air Force (RAAF) operating Australian Defence Force's fixed-wing fleet.A limited number of fixed-wing aircraft were used by Aviation Corps, mostly in a surveillance role.A ceremony was held at RAAF Base Townsville on 20 November 2009 to transfer the last three fixed-wing aircraft from the Army to the RAAF.