Coast Guard crewmembers from Maritime Safety and Security Team 91105 San Francisco transit the Oakland Estuary in Oakland California, Aug. 2, 2018. supporting the Ports, Waterways, and Coastal Security mission and providing non-compliant vessel boarding capability for service missions. Today, there are 11 MSST teams whose specialties include waterside security, maritime law enforcement and K-9 explosives detection units. Coast Guard photo by Petty Officer 1st Class Jetta Disco.