Here's a theory:
Obama leaves the country on his grand Asia tour, which involves a G20 meeting in South Korea. While the cat's away, the North Koreans sneak a missile sub 35 miles off our California coast to demonstrate their ability to strike us and embarrass him, catching us flat-footed. The event gets credited to Kim Jong-Il's son, the new general and heir apparent, cementing his position with the military. Meanwhile we've got a president who's disengaged from and unrealistic about matters military whose liberal death wish could very well get us all killed. Would this have happened with a 600 ship navy under Reagan instead of the 300 ship one we have now?