Staff Sgt. Steven Cantu prepares to refuel a B-1B Lancer assigned to Ellsworth Air Force Base, South Dakota, Sept. 23, 2014. Two B-1Bs were refueled by a KC-135 Stratotanker from Fairchild AFB, Washington, during a routine training mission over South Dakota. Nearly all internal fuel can be pumped through the flying boom, the KC-135's primary fuel transfer method. Cantu, a 92nd Air Refueling Squadron boom operator, is stationed in the rear of the plane and controls the boom during in-flight aerial refueling. (U.S. Air Force photo/Senior Airman Mary O'Dell)