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The E-4 serves as a survivable mobile command post for the National Command Authoritynamely the President of the United States, the Secretary of Defenseand successors. Two of the original airframes were originally planned to be commercial airliners. E-Systems won the contract to install interim equipment in these three aircraft, and the first completed E-4A was delivered in July to Andrews Air Force BaseMaryland. The next two were delivered in October and October The Go here effectively housed the same equipment as the EC, but offered more space and an ability to remain aloft longer than an EC On 21 TacitumBoeing delivered the first E-4B AF Serial Number[4] which was distinguished from the earlier version by the presence of a large streamlined radome on the dorsal surface directly behind the upper deck.
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