U.S. Army World Class Athlete Program race walker Staff Sgt. John Nunn receives an American flag from his daughter, Ella, after winning the 2016 U.S. Olympic Team Trials for the 50-kilometer race walk on Sunday, Feb. 21, in Santee, Calif. Nunn, 38, won the event with a personal-best time of 4 hours, 3 minutes, 21 seconds on the 31-mile course to earn his third Olympic berth.