f-16s. the base is home to u-2 spy planes that depart on 12-hour flights at high altitude, keeping a constant watch on the enemy to the north. for months, the u.s. military has been quietly beefing up its presence in the region. we have been following every step. in august, joint drills with the south koreans suddenly took on a new urgency. the enemy is left unnape med. it s clear which battle they are rehearsing for. we watched as american troops moved missiles, the most advanced in the world, into position. missile defense systems aren t just about defense. they give those who have them the ability to attack and survive a counter attack. while it s not been used against real incoming missiles, it adds another layer of protection to the extensive missile defense system already if place. then just a couple of weeks ago, what the president called an