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ANDREWS AIR FORCE BASE, Md. -- Maj. Gen. Robert E. Duignan, 4th Air Force commander, observes progress of a roofing project with Maj. Robert A. Haddix, 459th Civil Engineering Squardon commander. The general toured various organizations within the 459th Air Refueling Wing and attended the wing change of command ceremony July 13. Col. Stayce Harris handed the flag to Col. Tim Cahoon. Colonel Cahoon officially assumes command Aug. 1. (U.S. Air Force photo/Tech. Sgt. Eric Sharman)