As part of a simulated peacekeeping operation, Reserve Marines with 4th Law Enforcement Battalion, Force Headquarters Group, Marine Forces Reserve, ask approaching civilians to stop while they patrol down a road during exercise Platinum Wolf 2016 at Peacekeeping Operations Training Center South Base, Bujanovac, Serbia, May 19, 2016. The Marines are working with the partner nations of Bosnia, Bulgaria, Macedonia, Montenegro, Slovenia and Serbia during the final field exercise. During the field exercise the Marines complete various training scenarios along their patrol route, including being approached by service members with the Serbian Armed Forces simulating interaction with civilian press.