U.S. Marine Corps Lance Cpl. Kwan Walker, a networking administrator assigned to Marine Wing Communication Squadron 28, braces the cold during a conditioning hike during exercise Ullr Shield on Fort McCoy, Wis., Jan. 13, 2018.
Ullr Shield is a training exercise designed to improve 2nd Marine Aircraft Wing’s capabilities in extreme cold weather environments. (U.S. Marine Corps photo by Lance Cpl. Cody Rowe). Original public domain image from Flickr