region that the world has come to depend on. wolf? >> it certainly would. barbara starr at the pentagon, thank you. as the crisis in north korea plays out, chuck hagel said the units cannot afford to underestimate kim jong-un. he said all it takes is being wrong once for something disastrous to happen. cnn's tom foreman is in our virtual studio with a closer look at how a war could start. >> wolf, all eyes remain on the east coast of north korea, and on these, these mobile launch musudan missiles. if one of these takes off, everything changes very, very quickly. general, come on over here and let's bring if the map and talk about this some. if there is a launch, you say the very first thing would be some ak son by a satellite. why? >> tom, this satellite is going to pick up the infrastructure, the i.r. signature coming off the mobile launcher. instantaneously, it will send messages to the tracking system. so we can track the telemetry of