U.S. Marines Corps Lance Cpl. William Anderson with Headquarters and Support Battalion, Provost Marshal Office, Operations, participates in an active shooter, training Camp Foster, Okinawa, Japan, Nov. 26, 2019. Marines with PMO conducted the training to ensure readiness and reliability in the event of an active shooter. - U.S. Marines Corps Lance Cpl. William Anderson with Headquarters and Support Battalion, Provost Marshal Office, Operations, participates in an active shooter, training Camp Foster, Okinawa, Japan, Nov. 26, 2019. Marines with PMO conducted the training to ensure readiness and reliability in the event of an active shooter.