200129-M-BH464-1003 CAMP PENDLETON, Calif. (Jan. 29, 2020) An amphibious combat vehicle operated by Marines with Amphibious Vehicle Test Branch (AVTB), Marine Corps Tactical Systems Support Activity, prepares to enter the amphibious transport dock ship USS Somerset (LPD 25) as part of the vehicle’s developmental testing off the shore of Marine Corps Base Camp Pendleton, California, Jan. 29, 2020. The Marines of AVTB are currently testing the Marine Corps’ newest amphibious vehicle, which will replace the current amphibious assault vehicle. The testing consisted of entering and departing a naval vessel to assess and verify how well the ACV can integrate with naval shipping. This was the first time Marines have operated the new vehicle while boarding and departing a ship. (U.S. Marine Corps photo by Lance Cpl. Drake Nickels/Released)