U.S. Army Maj. Gen. Daniel E. Long Jr., Adjutant General of Virginia, passes the guidon to U.S. Air Force Col. Thomas Wark, 192nd Fighter Wing commander, during a change of command ceremony at Langley Air Force Base, Va., March 4, 2012. Wark came to Langley from the National Guard Bureau, where he was the director of Air, Space and Information Operations. (U.S. Air Force photo by Airman 1st Class Teresa Cleveland/Released)