The amphibious tip of the spear - U.S. Marine Corps Sgt. Matthew Carstensen, (center), instructor with amphibious assault vehicle instructor, Amphibian Crewman Course (AAC), Assault Amphibian School (AAS) Battalion, Training Command, observes Pfc. Watson Bryant, (left), and Pfc. Tristan Campbell, (right), students with AAS Bn., Training Command as they maneuver an amphibious assault vehicle (AAV) P7/A1 during ground guidance drills at Marine Corps Base Camp Pendleton, California, Jan. 28, 2019. The drills were conducted to evaluate the students on ground guidance procedures and techniques when guiding an AAV. (U.S. Marine Corps photo by Cpl. Juan Bustos)