The Marine Security Forces is a specialized security unit within the United States Marine Corps that is responsible for providing security at various military installations and facilities. They are trained in physical security, law enforcement, and anti-terrorism tactics to protect personnel, equipment, and classified information. The Marine Security Forces often work closely with other branches of the military, as well as local law enforcement agencies, to ensure the safety of military installations. Their mission is to deter and defend against any threats to national security, both at home and abroad.