Spc. Justin Fentress, from Pittsburgh, Pa., a water treatment specialist with the 326th Quartermaster Company (Water Storage and Distribution), removes ice build up on a Reverse Osmosis Purification Unit during Warrior Exercise 78-15-01 at Fort A.P. Hill Va., Jan. 12, 2015. WAREX 78-15-01 is one of several U.S. Army Reserve training exercises involving active duty, National Guard, U.S. Army Reserve and U.S. Navy personnel. (Army Photo by Sgt. Christopher Bigelow / 316th ESC)