Gavin Long, 29, of Kansas City has been identified by law enforcement as the man who killed three officers and wounded three others in Baton Rouge, Louisiana, on Sunday. CBS News notes the day was Long’s birthday. Authorities say Long is the only suspected gunman. Two other men were taken into custody as persons of interest. President Obama said the killer’s motive is unknown. Military records obtained by The Daily Beast show Long served in the Marine Corps from 2005 to 2010 as a data network specialist. He deployed to Japan and spent seven months in Iraq. He attended Marine infantry school at Camp Pendleton, California, which means he was trained in small-arms combat—particularly, how to shoot. Missouri court records show that he got divorced after he left the military. He then attended the University of Alabama briefly in 2012, and was on the dean’s list there.