U.S. Marines with Lima Company, Battalion Landing Team, 3rd Battalion, 1st Marine Regiment, and 15th Marine Expeditionary Unit, maneuver through a simulated urban environment aboard the USS Essex (LHD 2) during Amphibious Squadron/Marine Expeditionary Unit Integration Training (PMINT) off the coast of San Diego March 2, 2015. Pre-mission rehearsals are vital to ensure that the raid force is prepared before ever going into harms way. (U.S. Marine Corps photo by Cpl. Steve H. Lopez/Released)