Some dismiss this movie as ridiculous by saying N.Korea is no threat to invade the United States. While currently true, it is worth remembering that small, but ardent Communist nations have been difficult opponents in the past. Remember the Cuban military that was ferried to Africa by the Russians? Very troublesome. With sponsorship and support, Cuba, Venezuela, Iran or North Korea could punch above their weight and cause us problems, especially if their effort was preceded by an EMP (Electro-Magnetic Pulse) attack on our power grids and cyber networks. So, this movie can provide useful instruction for those who think distance and size will always insulate from threat. Additionally, consider the steady reduction in our military size, replenishment of existing forces and attention to distant threats and the initially fanciful idea suggested in this movie becomes more thought provoking. Go see the movie.