The Boeing CH-47 Chinook is an American twin-engine, tandem rotor heavy-lift helicopter.Its primary roles are troop movement, artillery placement and battlefield resupply.he Royal Air Force variant of the CH-47C is known as the Chinook HC1. The export version of the CH-47C Chinook for the Italian Army was designated CH-47C Plus. The Royal Air Force versions of the CH-47D are known as the Chinook HC2 and HC2A.