Senior Airman Sierra Dopfel, a refueling boom operator assigned to the Air Force Reserve 18th Air Refueling Squadron, 931st Air Refueling Group, McConnell Air Force Base, Kan., looks out of the boom pod of a KC-135 Stratotanker during an air refueling training mission, Aug. 3, 2013. The KC-135 was refueling a B-52 Stratofortress assigned to the 307th Bomb Wing, Barkesdale AFB, La. Air Refueling training missions ensure that both the refueling and receiving aircrews maintain proficiency in air refueling operations, allowing the Air Force to extend its reach around the globe. (U.S. Air Force photo/Staff Sgt. Jess Lockoski)