Corporal Eduardo Rocha and Cpl. Julian McGee, motor transport mechanics with 3rd Battalion, 11th Marine Regiment, conduct preventive maintenance on a Humvee during exercise Pacific Horizon 2015 aboard Marine Corps Base Camp Pendleton, Calif., Oct. 21. PH-15 is a scenario driven, simulation supported crisis response exercise designed to improve 1st Marine Expeditionary Brigade's and Expeditionary Strike Group 3's interoperability and strengthen Navy-Marine Corps relations by conducting an in-stream Maritime Prepositioning Force offload of equipment by providing host country civil-military security assistance, and by conducting infrastructure restoration support from Oct. 20-28, 2014. (U.S. Marine Corps Imagery by Corporal Cansin P. Hardyegritag)