Lance Cpl. Scott Kesler, a rifleman with Company C, 1st Battalion, 25th Marines, 4th Marine Division, poses for a photo during exercise Riley Xanten in Ontario, Canada, Feb. 6, 2017. Kesler and his fellow Marines joined soldiers with the Royal Hamilton Light Infantry, Wentworth Regiment, Canadian Armed Forces, to train in an arctic environment and exchange knowledge on cold weather tactics, survival skills, shelter building, ice fishing, and more. (U.S. Marine Corps photo by Sgt. Sara Graham/released) - Lance Cpl. Scott Kesler, a rifleman with Company C, 1st Battalion, 25th Marines, 4th Marine Division, poses for a photo during exercise Riley Xanten in Ontario, Canada, Feb. 6, 2017. Kesler and his fellow Marines joined soldiers with the Royal Hamilton Light Infantry, Wentworth Regiment, Canadian Armed Forces, to train in an arctic environment and exchange knowledge on cold weather tactics, survival skills, shelter building, ice fishing, and more. (U.S. Marine Corps photo by Sgt. Sara Graham/released)

Cpl. Tevfik Ozkaynak (left), a rifleman with Company C, 1st Battalion, 25th Marine Regiment, 4th Marine Division and Sgt. Lee Gugino (right), a squad leader, observe objective points on a map while on a reconnaissance patrol during exercise Riley Xanten II, in Burwash, Ontario, Feb. 3-5, 2017. During the exercise, the Marines joined soldiers from the Canadian Armed Forces to exchange knowledge and increase proficiency in cold weather tactics, survival skills, shelter building, ice fishing, and more. (U.S. Marine Corps photo by Sgt. Sara Graham/released) - Cpl. Tevfik Ozkaynak (left), a rifleman with Company C, 1st Battalion, 25th Marine Regiment, 4th Marine Division and Sgt. Lee Gugino (right), a squad leader, observe objective points on a map while on a reconnaissance patrol during exercise Riley Xanten II, in Burwash, Ontario, Feb. 3-5, 2017. During the exercise, the Marines joined soldiers from the Canadian Armed Forces to exchange knowledge and increase proficiency in cold weather tactics, survival skills, shelter building, ice fishing, and more. (U.S. Marine Corps photo by Sgt. Sara Graham/released)