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As the protests flared up for a third day on Sunday, armed National Guard troops guarded a gated business park across the street from the hardware store.

U.S. military officials have largely been guarded against reducing the U.S. troop size in South Korea.

Its Arizona facility "Fab 21" is closely guarded.

Since its inception roughly 50 years ago, the recipe remains nearly identical and closely guarded.

The border, which is heavily guarded and requires special permits to cross, has long been used by people visiting family members, attending weddings or reconnecting with loved ones across the border.