A US Navy Officer observes ship boarding drills performed by Fleet Protection Group Royal Marines
(FPGRM), operating from Royal Navy frigate, HMS Somerset. Note the use of iron sights rather than the 4x4 SUSAT optics usually fitted to the Marine's SA80A2
rifles. These sghts are better for the close quarters environment of a ship.
U.S. Navy photo by Photographer’s Mate 2nd Class Michael Sandberg