E-4 Nightwatch
Beginning in 1974, the National Emergency Airborne Command Post stood ready to provide the President, Secretary of Defense, their support staff, and successors with wartime command and control capabilities from this highly modified Boeing 747, which can still function even in the event of an electromagnetic pulse attack. Although the United States has never needed “Nightwatch” for its intended mission, one plane and its crew are still kept on alert status at all times.