U.S. Marine Corps combat engineers attached to Battalion Landing Team 3/5, 31st Marine Expeditionary Unit (MEU), utilize a GPS during an Instrument Set, Reconnaissance and Surveying (ENFIRE) class aboard the amphibious assault ship USS America (LHA 6) in the Philippine Sea, July 6, 2021. (U.S. Marine Corps photo by Cpl. Karis Mattingly)
U.S. Marines review how to make nine-line calls on a radio during a communications exercise at the Jungle Warfare Training Center in Okinawa, Japan, Oct. 17, 2018. (U.S. Marine Corps photo by Pfc. Kindo Go)