Col. Mark Sigler, 434th Operations Group commander, receives the 434th OG guidon from Col. Doug Schwartz, 434th Air Refueling Wing commander, during an assumption of command ceremony at Grissom Air Reserve Base, Ind., March 7, 2015. As the 434th OG commander, Sigler is responsible for the day-to-day operational training and overall management of two KC-135R flying squadrons and an operations support squadron. (U.S. Air Force photo/Tech. Sgt. Benjamin Mota)
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