PETERSON AIR FORCE BASE, Colo. — Dennis Hall, father of Capt. Ryan Hall, flips through old photographs of his son during his military career at Peterson Air Force Base, Colorado, on November 14, 2018. Capt. Hall died on February 18, 2012 when his single-engine U-28 aircraft went down returning from an intelligence, surveillance and reconnaissance mission in Djibouti on the Horn of Africa. (U.S. photo by Staff Sgt. Alexandra M. Longfellow/Released)