Chinook Part 2
U.S. Army Sgt. Benjamin Stocker, Colorado Army National Guard CH-47 flight engineer and mechanic, does an engine check on his helicopter March 3, 2016, at the Army Aviation Support Facility on Buckley Air Force Base, Colo. The crew chief is responsible for ensuring the aircraft is safe and ready to go before flights by looking and listening to how the engine runs. (U.S. Air Force photo by Airman 1st Class Gabrielle Spradling/Released)

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