U.S. Soldiers assigned to the 15th Engineer Battalion, 18th Military Police Brigade, acting as Opposition Forces (OPFOR), place obstacles to obstruct pathways during Combined Resolve XI in Hohenfels, Germany, Dec. 7, 2018. Combined Resolve XI is a biannual exercise that serves as the combat training center certification exercise for regionally allocated forces. This iteration of the exercise takes place in two phases at the Grafenwoehr and Hohenfels training areas between Nov. 26-Dec. 14, 2018 and Jan. 13-25, 2019. (U.S. Army photo by Pfc. Denice Lopez)