The Boeing E-4 Advanced Airborne Command Post, with the project name "Nightwatch",is an aircraft operated by the United States Air Force (USAF). To create the E-4 series, four Boeing 747-200B airframes were specially modified to serve as a survivable mobile command post for the National Command Authority, namely the President of the United States, the Secretary of Defense, and successors. The four E-4Bs are operated by the 1st Airborne Command and Control Squadron of the 55th Wing located at Offutt Air Force Base, near Omaha, Nebraska. An E-4B is denoted a "National Airborne Operations Center" when in action.
|Role||Airborne command post|
|Primary user||United States Air Force|
|Unit cost||US$223 million (1998 dollars)
|Developed from||Boeing 747-200|
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