U.S. Army Sgt. Ryan Powell, right, supervises Spc. Tyler Minnick, left, as Minnick removes a chock block from a Stryker armored fighting vehicle during railhead operations in Konotop, Poland, Jan. 11, 2016. Before vehicles can be moved from the train, soldiers must conduct cold-start procedures and remove equipment used to hold the vehicles in place during transit. Both soldiers are infantryman assigned to Knight Troop, 3rd Squadron, 2nd Cavalry Regiment. U.S. Army photo by Sgt. Paige Behringer