Maj. Scott Fisher, 506th Expeditionary Aerial Refueling Squadron pilot, and 1st Lt. Brandon Rader, 506th EARS co-pilot, implement a preflight checklist prior to departing Andersen Air Force Base, Guam, April 16, 2015, on a KC-135 Stratotanker aerial refueling mission. The tankers routinely support B-52 Stratofortress aircrews with refueling in support of U.S. Pacific Command’s Continuous Bomber Presence in the Asia-Pacific region. Fisher and Rader are deployed to Andersen Air Force Base from the Pennsylvania Air National Guard. (U.S. Air Force photo by Staff Sgt. Melissa B. White/Released)