Reserve Marines with 3rd Civil Affairs Group, Force Headquarters Group, Marine Forces Reserve, teach a class on key leader engagement to Marines with 4th Law Enforcement Battalion, FHG, MARFORRES, Bosnian soldiers and Bulgarian soldiers during exercise Platinum Wolf 2016 at Peacekeeping Training Operations Center South Base in Bujanovac, Serbia, May 10, 2016.The exercise aims to provide training on peacekeeping operations and enhance interoperability between all of the participating nation including Bosnia, Bulgaria, Macedonia, Montenegro, Slovenia, Serbia and the United States. (U.S. Marine Corps photo by Sgt. Sara Graham)