U.S Air Force Maj. Gen Lawrence Wells, 9th Air Force commander, Col. Korvin Auch, outgoing 633rd Air Base Wing commander, Chief Master Sgt. Trae R. King, 633rd ABW command chief, and Col. John J. Allen, incoming 633rd ABW commander, prepare to for the ceremonial guidon exchange during the 633rd ABW change of command ceremony on Langley Air Force Base, Va., April 22, 2013. Allen will assume command of the 633rd ABW. (U.S. Air Force photo by Airman 1st Class Kimberly Nagle/Released)