The commanding officer of a military air defence base is awoken at 3;00 am in the morning by one of his officers because a rocket believed to carry a nuclear missile is on course to impact within 2 miles of them in 32 minutes.  But why would another planet want to launch a rocket attack now without any provocation. They don't know anything about the life on the planet except that they can launch rockets and that both planets have been trying to communicate with other for years. It seems strange that they would launch a nuclear rocket to impact on a radar base away from a large populated area so the first orders from the president are not to retaliate.