The E-4B is one of the so-called Doomsday planes.
In the event of a nuclear war, a terrorist attack, an alien invasion or, generally speaking, Armageddon, the U.S. Air Force’s four E-4B planes based at Offutt Air Force Base, Nebraska will be responsible to keep the U.S. Secretary of Defense, the Joint Chiefs of Staff and other top personalities alive whilst Obama would be on board the Air Force One.
The E-4B is a modified B747-200 that serves as National Airborne Operations Center providing a flying command, control and communications center to direct nuclear (and conventional) forces, by receiving, verifying and relaying EAM (Emergency Action Messages).
One aircraft is usually airborne every 12 hours, with another one ready for departure with a 5-minute notice. An E-4B always supports Air Force One’s trips abroad. If national command centers on the ground are attacked or unavailable, an E-4B is immediately scrambled.
The following video gives you the opportunity to take a guided tour inside one of these interesting and important planes.
H/T to Jonathan Kohn for the heads-up
Image credit: U.S. Air Force