Marines with 3rd Battalion, 5th Marine Regiment, 1st Marine Division, establish security during a helicopter raid, as part of the Marine Corps Combat Readiness Evaluation (MCCRE), aboard Marine Corps Base Camp Pendleton, Calif., Aug. 4, 2015. The MCCRE is used evaluate the operational readiness of a designated unit. - Marines with 3rd Battalion, 5th Marine Regiment, 1st Marine Division, establish security during a helicopter raid, as part of the Marine Corps Combat Readiness Evaluation (MCCRE), aboard Marine Corps Base Camp Pendleton, Calif., Aug. 4, 2015. The MCCRE is used evaluate the operational readiness of a designated unit.