Pvt. Alejandro Calero, a U.S. Army Reserve military

Pvt. Alejandro Calero, a U.S. Army Reserve military police Soldier from the 320th MP Company, experiences the effects of the gas chamber during the annual training exercise Centurion Focus on Fort Stewart, Georgia, July 22, 2018. The 317th MP Battalion performs readiness operations and Mission Essentials Task List validation in support of Operation Centurion Focus from July 11 through Aug 8. On order the 317th MP Battalion assumes responsibility for conducting the three military police doctrinal missions; maneuver supports, detention operations and base defense operations. (U.S. Army Reserve photo by Sgt. Elizabeth Taylor)