U.S. Marines with 3rd Assault Amphibian Battalion, 1st Marine Division, conduct integrated military operations in urban terrain during Integrated Training Exercise (ITX) 3-21 at Marine Corps Air Ground Combat Center Twentynine Palms, California, April 8, 2021. br br Marines worked in conjunction with 1st Battalion, 5th Marine Regiment, 1st Marine Division, to secure a mock city to employ the Amphibious Combat Vehicle as part of ITX 3-21. br br "The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement."br br br br Credit to : U.S. Marine Corps video by Lance Cpl.