A man and woman comfort one another by a makeshift memorial outside the Armed Forces Career Center, Friday, July 17, 2015, in Chattanooga, Tenn. Counterterrorism investigators are trying to figure out why a 24-year-old Kuwait-born man, who by accounts lived a typical life in suburban America, attacked the career center and a Navy-Marine training center a few miles away in a shooting rampage that killed four Marines. (Photo by Mark Zaleski/AP Photo)
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