Marines and Sailors with U.S. Marine Corps Forces, Special Operations Command, demonstrate proper removal of a gas mask from a simulated chemical contact victim while training for the medical management of chemical and biological causalties during an exercise at Stone Bay on Marine Corps Base Camp Lejeune, N.C., Dec. 6, 2017. Long prohibited by international agreements, chemical weapons have been increasingly used on the battlefield by American adversaries including violent extremist organizations. Raiders gained valuable practical application skills in handling casualties in complex and dangerous chemical environments. - Marines and Sailors with U.S. Marine Corps Forces, Special Operations Command, demonstrate proper removal of a gas mask from a simulated chemical contact victim while training for the medical management of chemical and biological causalties during an exercise at Stone Bay on Marine Corps Base Camp Lejeune, N.C., Dec. 6, 2017. Long prohibited by international agreements, chemical weapons have been increasingly used on the battlefield by American adversaries including violent extremist organizations. Raiders gained valuable practical application skills in handling casualties in complex and dangerous chemical environments.