A special agent uses special lighting to see bodily fluids that would appear invisible to the naked eye during Capital Shield at Fort Belvoir, Virginia, September 6, 2017. Capital Shield is a three-day training exercise, Sept. 5-9, for U.S. Army Reserve and active duty special agents. Key training events included crime scene and intelligence management, hostage and crisis negotiation and evidence processing. The Special Agents were trained for real-world incidents and established mutual partnerships between U.S. Army components. (U.S. Army Reserve photo by Sgt. Audrey Hayes)