Marines from Alpha Company, 4th Assault Amphibian Battalion, out of Norfolk, Virginia, practice loading radio frequencies on to a Army Navy Portable Radio Communications 117F radio at Camp Grayling, Mich., in support of Exercise Northern Strike, Aug. 5, 2018. 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 Cpl. Niles Lee)