Petty Officer 3rd Class Glenn Springston and members from the San Francisco-based U.S. Coast Guard Port Security Unit 312 test the fit and function of their M50 Joint Service General Purpose Mask during the Department of Defense-led Pacific Blitz 2019 exercise in Port Hueneme, California, March 6, 2019. Pacific Blitz provided an opportunity for Coast Guard service members assigned to PSU 312 to train alongside other members of the armed forces through realistic and relevant training necessary for effective global crisis response. U.S. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi