CHATTANOOGA, TN – JULY 17: Members of the FBI Evidence Response Team look at the bullet riddle doors as they investigate the shooting at the Armed Forces Career Center/National Guard Recruitment Office on July 17, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on the military recruiting station at the strip mall and then drove to an operational support center operated by the U.S. Navy and killed four United States Marines there, more than seven miles away, (Photo by Joe Raedle/Getty Images)