High Quality Content by WIKIPEDIA articles! The Boeing Chinook is a tandem rotor helicopter operated by the Royal Air Force. A series of variants based on the United States Army`s Boeing CH-47 Chinook, the RAF Chinook fleet is the largest outside the United States. RAF Chinooks have seen extensive service including fighting in the Falklands War, peace-keeping commitments in the Balkans, and action in the Iraq and Afghanistan wars.