Boeing’s CH-47 Chinook is an American twin-engine, tandem rotor heavy-lift helicopter. It is typically used for troop movement, artillery placement, and battlefield resupply. With speeds up to 170 knots (196 mph, 315 km/h) the helicopter is faster than utility and attack helicopters of the 1960s. The CH-47 is among the heaviest lifting Western helicopters. The Chinook helicopter has been sold to 16 nations. The US Army and Royal Air Force are among the end-users. The U.S. Army plans to operate the CH-47 Chinook until 2038.