Service members assigned to the San Francisco-based Coast Guard Port Security Unit 312 don M50 Joint Service General Purpose Masks while staffing an entry control point at Naval Base Port Hueneme, California, in support of Exercise Pacific Blitz 2019 (PacBlitz19), March 7, 2019. Members from the San Francisco-based PSU 312 participated in PacBlitz19 to increase maritime readiness to be prepared for real-world crisis situations. (U.S. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi).