Deep under the Pentagon, there is a door. An armed guard stands at this door, ever watchful. Should you present the proper credentials, you will be allowed beyond. Inside is a brightly lit and sterile elevator. Should you take that elevator down as far as it goes you may find yourself in a large, open space underground. To the naked eye, it may look like an indoor football field. But to the nation’s top military commanders, it looks like the training grounds for America’s elite freedom strike force. Enemies of America: Are you ready for some football?