Staff Sgt. Eric McElroy, 40th Helicopter Squadron flight engineer, completes a takeoff and landing data card, or TOLD card, Nov. 2, 2016, at Malmstrom Air Force Base, Mont. Flight engineers use the cards to ensure the aircraft has enough fuel, is under the maximum weight allowance and can last the full duration of a mission. (U.S. Air Force photo/Airman 1st Class Daniel Brosam)