150716-N-QO941-002 CHATANOOGA, Tenn. (July 16, 2015) Police tape and a makeshift memorial frame the scene at an Armed Forces Career Center, where earlier in the day an active shooter opened fire, injuring one U.S. Marine. The gunman later moved to the nearby Navy Operational Support Center (NOSC) firing multiple shots, killing four Marines and injuring one Sailor. (U.S. Navy photo by Damon J. Moritz/Released)