Air Force Capt. Glenn Cook’s name is inscribed on Vietnam Veteran’s Memorial in Washington, D.C., where the U.S. Air Force Honor Guard held a flag folding ceremony May 19, 2015. Cook’s plane was shot down near Nha Trang, Vietnam, Oct. 21, 1969. His remains were never found. (U.S. Air Force photo/Senior Airman Joshua R. M. Dewberry)