British Royal Marines discuss their scheme of maneuver during an assault on Range 205 as part of Exercise Black Alligator aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Sept. 13, 2016. Black Alligator, an annual training exercise, consists of approximately 1,000 British Royal Marines and 170 Dutch Royal Army soldiers who train aboard the installation in excess of 45 days to conduct relevant live-fire combined arms training, urban operations, and joint and coalition-level integration alongside more than 300 U.S. Marines consisting of artillerymen, engineers and tankers. - British Royal Marines discuss their scheme of maneuver during an assault on Range 205 as part of Exercise Black Alligator aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Sept. 13, 2016. Black Alligator, an annual training exercise, consists of approximately 1,000 British Royal Marines and 170 Dutch Royal Army soldiers who train aboard the installation in excess of 45 days to conduct relevant live-fire combined arms training, urban operations, and joint and coalition-level integration alongside more than 300 U.S. Marines consisting of artillerymen, engineers and tankers.