Lance Cpl. Joshua Ruzbacki, rifleman, Company K, 3rd Battalion, 25th Marine Regiment, 4th Marine Division, navigates an ammo can though a tunnel while participating in the Leadership Reaction Course during exercise Nordic Frost at Camp Ethan Allen Training Site in Jericho, Vt., Jan. 8. 2017. The LRC is designed to use small-unit leadership to overcome obstacles, which is one of the main focuses of the exercise. (U.S. Marine Corps photo by Cpl. Melissa Martens/ Released)