200208-N-YZ252-0006 BANGOR, Maine (Feb. 8, 2020) Master at Arms 1st Class Matthew Duhaine, from Brunswick, Maine, trains a class of reserve component Sailors on active shooter situations. Duhaine is serving on active duty for special eork at Navy Operational Support Center Bangor, Maine. (U.S. Navy photo by Chief Mass Communication Specialist Roger Duncan/Released)