FBI Special Agent Michael Culloton, left, and Lt. Col. Tim Tyler, chief financial officer with the 416th Theater Engineer Command (TEC) and Illinois State Trooper, demonstrate proper movement techniques with the M9 pistol, during active shooter training at the 416th TEC headquarters, 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)