mainland, but because of its proximity to china, japan, the philippines and of course the korean peninsula, guam has long been a key facility for the u.s. military. the u.s. takes up about 30% of the island with a naval base and an air force installation. there s been talk in recent years about relocating thousands of marines from okinawa, japan to guam. last month when north korea tested that intercontinental ballistic missile, the u.s. responded by flying two supersonic jets, two sets of bombers, from guam over the korean peninsula in a show of force. while the u.s. military is the main driver of the guam economy, tourism is second and threats of an attack by north korea are not helping to draw visitors. what thanks this threat so interesting is that while north korea has routinely warned of attacking the u.s., those warnings are almost never specific. so singling out guam is a brand