Col. David Kelley accepts the 576th Flight Test Squadron flag from Maj. Gen. Anthony Cotton, 20th Air Force commander, during a change-of-command ceremony at Vandenberg Air Force Base, Calif., June 1, 2017. In support of the 'deter and assure' mission, the 576th FLTS determines the effectiveness and accuracy of the ICBM force by planning, preparing and conducting ICBM ground and flight tests. (U.S. Air Force photo)