Staff Sgt. Ivan Collautti, a military policeman and crowd control instructor from Slovenia, checks the integrity of the defensive shell the Marines of 4th Law Enforcement Battalion, Force Headquarters Group, Marine Forces Reserve, made during exercise Platinum Wolf 2016 at Peacekeeping Training Operations Center South Base in Bujanovac, Serbia, May 12, 2016. Platinum Wolf brings together service members from Bosnia, Bulgaria, Macedonia, Montenegro, Serbia, Slovenia, and the United States to train in peacekeeping operations and non-lethal weapons capabilities. (U.S. Marine Corps photo by Sgt. Sara Graham)