Pfc. Connor R. Leahy (left), and Lance Cpl. Nicholas T. Sams, mortar Marine, for Weapons Company, 3rd Battalion, 25th Marine Regiment, 4th Marine Division, load and fire 81mm mortar rounds during exercise Nordic Frost at Camp Ethan Allen Training Site in Jericho, Vt., Jan. 7. 2017. Throughout the exercise, Marines conduct training in a demanding cold- weather environment that places an emphasis on small-unit leadership. (U.S. Marine Corps photo by Cpl. Melissa Martens/ Released)