Marines fortified and evacuated an embassy. Navy Corpsmen will triage mass casualties and Recon Marines will take a beach on San Clemente Island. These fictional scenarios meant to teach real-world encounters are part of an annual 1st Marine Division training exercise known as Steel Knight now underway at Camp Pendleton . Residents of the communities near the base might hear live-fire training, including explosions and see aircraft and amphibious landings. The two-week exercise, ending on Dec.