Gen. Donald J. Hoffman, commander, Air Force Materiel Command, presided over the change of command ceremony held Friday, May 13, at the National Museum of the United States Air Force. Maj. Gen. William McCasland succeeds Maj. Gen. Ellen Pawlikowski as the Air Force Research Laboratory commander. General Pawlikowski was confirmed for appointment to the grade of lieutenant general with assignment as commander, Space and Missile Systems Center, Air Force Space Command, Los Angeles Air Force Base, Calif. (U.S. Air Force photo)