Marine Corps Air Ground Combat Center, Twentynine Palms, California - Marines with 1st Battalion, 3rd Marine Regiment used the P7 amphibious assault vehicle to travel to various locations in order to reach their objectives during Large Scale Exercise 15 at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Aug. 14 – 15, 2015. LSE-15 is a combined U.S. Marine Corps, Canadian and British exercise conducted at the brigade level, designed to enable live, virtual and constructive training for participating forces.