Marine Corps Warfighting Laboratory executed Dense Urban Operations limited operational experiment 2019 called Project Metropolis II, with Marines assigned to 3rd Battalion, 8th Marine Regiment; squad-size element from 1st Battalion, 6th Marine Regiment; and British Royal Marines assigned to 8 Troop Charlie Company, at Muscatatuck Urban Training Center, Indiana, August 20, 2019 (U.S. Marine Corps/Matt Lyman)