U.S. Air Force Staff Sgt. Brandon McAnally, 54th Air Refueling Squadron boom operator, talks to a group of children from Will Rogers Elementary School, Burns Flat, Okla., about the oxygen tanks aboard a U.S. Air Force KC-135 Stratotanker refueling aircraft during a Science, Technology, Engineering, and Math fair, Feb. 5, 2015. The students were able to tour a U.S. Air Force KC-135 during their trip and a U.S. Air Force C-17 Globemaster III cargo aircraft. (U.S. Air Force photo by Airman 1st Class Megan E. Acs/Released)