LONG BEACH, Calif (May 12, 2021) Master-at-Arms 3rd Class Mariam Baker, a reservist from Navy Operational Support Center Sacramento, Calif., assigned to Maritime Expeditionary Security Squadron (MSRON) 11, establishes a fighting position during a simulated sniper fire attack 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.)