CAMP PENDLETON, Calif. (Sept. 17, 2020) Secretary of Defense Mark T. Esper prepares to take off in an MV-22 Osprey after viewing a static display of the amphibious combat vehicle with 3rd Assault Amphibian Battalion, 1st Marine Division at Camp Pendleton, California, Sept. 17, 2020. The amphibious combat vehicle will replace the amphibious assault vehicle in all assault amphibian battalions across the Marine Corps, equipping Marines to effectively conduct sea-to-shore operations. (U.S. Marine Corps photo by Staff Sgt. Kyle C. Talbot)