Lt. Col. Matthew Griffin, right, 339th Flight Test Squadron commander, salutes Col. Sean Bittner, 413th Flight Test Group commander, during a change of command ceremony Sep. 17, 2020, at Robins Air Force Base, Georgia. Griffin was previously the 339th FLTS director of operations and assumed command of the unit from Col. John Lesho. (U.S. Air Force photo by Jamal D. Sutter)