SAN DIEGO (Feb. 21, 2023) Master-at-Arms 2nd Class Andrew Martin, a tactical craft crewman gunner assigned to Maritime Expeditionary Security Squadron (MSRON) 11, conducts a weapon check prior to a High Value Asset (HVA) escort mission exercise as part of Maritime Expeditionary Security Force (MESF) Boat University (BU) advance course in San Diego. MESF BU is designed to train and qualify the MESF to sustain mobilization readiness. MESF 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.)