During the US military presence, a sentry was posted at each entrance to the community to ensure the safety and privacy of the residents and to prevent disputes with locals. A garrison of American MPs barred entry to those not in the US military. The residents enjoyed extraterritorial privileges, as if the zone were a country inside a country.
美軍駐台時期，為了確保眷區民眾安全與隱私，避免與地方發生糾紛，每個眷區出入口都設有崗哨，由美國憲兵駐守，禁止非美軍人員進入以確保安全，並擁有治外法權，彷彿國中之國。