U.S. Air Force Col. Stephen Waller, 57th Operations Group commander, stands in front of the operations building July 7, 2011, at Nellis Air Force Base, Nev. Waller officially became the commander May 24, 2011. His group educates, plans exercises, advocates the integration of airpower into the joint fight, and supports the preparation of the combat air force's maintainers and aircrews. Waller oversees operations of six squadrons and two detachments from Nellis and four geographically separated locations. (U.S Air Force photo by Senior Airman Stephanie Rubi/Released)
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