U.S. Marines Lance Cpl. Devin Sulliven (left), Gunner,

U.S. Marines Lance Cpl. Devin Sulliven (left), Gunner, and Lance Cpl. Jonathan Branch (Right), Assistant Gunner, both with Weapons Company, 1st Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve, fire an M252 81mm Medium Extended Range Mortar on Fire Point 93, U.S. Army Mountain Warfare Center in Ethan Allen, Vt., Jan. 9, 2016. The annual training is conducted in a cold weather mountainous environment in order to sustain offensive and defensive core competencies to stay ready, relevant and responsive. (U.S. Marine Corps photo by Lance Cpl. Kimberly Aguirre/Released)