Air National Guardsmen from the 113th Wing of the Washington, D.C., Air National Guard fold American flags at the Air Force Memorial in Arlington, Va., April 11, 2014. In his speech at the June 24, 2016, retirement ceremony for Air Force Chief of Staff Gen. Mark A. Welsh III, Defense Secretary Ash Carter said Welsh lived by the motto inscribed in the base of the memorial: ‘Integrity first; service before self; excellence in all we do.’ Air National Guard photo by 1st Lt. Nathan T. Wallin