U.S. National Guard

"Britannica Concise Encyclopedia: U.S. National Guard (미국 주 방위군, 주 방위 예비군)

Reserve group organized by the U.S. Army and Air Force. Every state and territory of the U.S. has a National Guard, which can be called on by state governors during emergencies such as riots and natural disasters. Guard units may also be ordered into active duty for up to two years by the U.S. president in the event of a national emergency. Enlistment in the National Guard is voluntary."

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