Marines with Weapons Company, 1st Battalion, 24th Marines, 25th Marine Regiment, 4th Marine Division, navigate the route to their next checkpoint during the final exercise of exercise Nordic Frost on Camp Ethan Allen Training Site in Jericho, Vt., Jan. 22, 2018. The exercise allowed Marines to demonstrate their ability to operate in a cold weather mountainous environment, conducting land navigation, marksmanship training, demolitions, call for fire training and other core competencies. (U.S. Marine Corps photo by Pfc. Samantha Schwoch/released) - Marines with Weapons Company, 1st Battalion, 24th Marines, 25th Marine Regiment, 4th Marine Division, navigate the route to their next checkpoint during the final exercise of exercise Nordic Frost on Camp Ethan Allen Training Site in Jericho, Vt., Jan. 22, 2018. The exercise allowed Marines to demonstrate their ability to operate in a cold weather mountainous environment, conducting land navigation, marksmanship training, demolitions, call for fire training and other core competencies. (U.S. Marine Corps photo by Pfc. Samantha Schwoch/released)

U.S. Marine Corps Lance Cpl. Tyler Varias, a mortar man, with Weapons Company, 1st Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve, participates in Exercise Northern Strike 17 at Camp Grayling Joint Maneuver Combat Center, Michigan from July 29 to Aug. 12, 2017. Exercise Northern Strike is a National Guard Bureau-sponsored training exercise that unites service members from multiple branches, states and coalition countries to conduct combined ground and air combat operations. (U.S. Marine Corps photo by Lance Cpl. Imari J. Dubose/Released). - U.S. Marine Corps Lance Cpl. Tyler Varias, a mortar man, with Weapons Company, 1st Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve, participates in Exercise Northern Strike 17 at Camp Grayling Joint Maneuver Combat Center, Michigan from July 29 to Aug. 12, 2017. Exercise Northern Strike is a National Guard Bureau-sponsored training exercise that unites service members from multiple branches, states and coalition countries to conduct combined ground and air combat operations. (U.S. Marine Corps photo by Lance Cpl. Imari J. Dubose/Released).

Lance Cpl. Ethan Evans (left), a motor transport mechanic with 6th Air Naval Gunfire Liaison Company, Force Headquarters Group, instructs Lance Cpl. Jacob Levy, a ground electronic maintenance technician with 6th ANGLICO, on the M249 squad automatic weapon range Jan 23, 2016 at Camp Roberts, Calif. The Marines of 6th ANGLICO conducted call-for-fire exercises and machine gun ranges alongside mortar platoons from 2nd Battalion, 23rd Marine Regiment, 4th Marine Division, to complete comprehensive live-fire training. - Lance Cpl. Ethan Evans (left), a motor transport mechanic with 6th Air Naval Gunfire Liaison Company, Force Headquarters Group, instructs Lance Cpl. Jacob Levy, a ground electronic maintenance technician with 6th ANGLICO, on the M249 squad automatic weapon range Jan 23, 2016 at Camp Roberts, Calif. The Marines of 6th ANGLICO conducted call-for-fire exercises and machine gun ranges alongside mortar platoons from 2nd Battalion, 23rd Marine Regiment, 4th Marine Division, to complete comprehensive live-fire training.