LONG BEACH, Calif.,(May 12, 2021) Engineman 2nd Class Zavala Marcos, assigned to Maritime Expeditionary Security Squadron (MSRON) 11, fires a .50-caliber machine gun aboard a high mobility multi-purpose wheeled vehicle during a simulated entry control point security breach as part of unit level training readiness and assessment certification provided by Maritime expeditionary Security Group (MESG) 1 Training Evaluation Unit. The Maritime Expeditionary Security Force is a core Navy capability that provides port and harbor security, high value asset security, and maritime security in the coastal and inland waterways. (U.S. Navy photo by Chief Boatswain�s Mate Nelson Doromal Jr.)