- Marines with 4th Law Enforcement Battalion, Force Headquarters Group, Marine Forces Reserve, listen attentively at a counter IED class during exercise Platinum Wolf 2016 at Peacekeeping Training Operations Center South Base in Bujanovac, Serbia, May 10, 2016. The Marines join six other partner nations including Bosnia, Bulgaria, Macedonia, Montenegro, Slovenia and Serbia to conduct peacekeeping operations and non-lethal weapons training over the course of two weeks. (U.S. Marine Corps photo by Sgt. Sara Graham)