FBI Special Agent Michael Culloton explains the dangers, communalities, law enforcement prevention efforts, and best reactive and proactive responses to an active shooter event, to Soldiers of the 416th Theater Engineer Command, in Darien, Ill. The training provided by Special Agent Culloton gave Soldiers tools to react and protect themselves in an active shooter situation, Aug. 6, 2016. (U.S. Army photo by Spc. Brianna Saville/Released)