The E-4B, a militarized version of the Boeing 747-200, is a four-engine, swept-wing, long-range high-altitude airplane capable of refueling in flight. The main deck is divided into six functional areas: a command work area, conference room, briefing room, an operations team work area, communications area and rest area.

Yes, the Boeing 747 has two highly specialized military versions operated by the United States Air Force. The most famous is the VC-25A (and the upcoming VC-25B based on the 747-8), which serves as Air Force One when the President is on board. These aircraft are essentially flying "White Houses" with advanced secure communications, medical suites, and defensive countermeasures. Even more specialized is the E-4B Nightwatch, commonly known as the "Doomsday Plane." Based on the 747-200, the E-4B serves as the National Airborne Operations Center. It is designed to survive an electromagnetic pulse (EMP) and acts as a mobile command center for the Secretary of Defense and the Joint Chiefs of Staff during a national emergency, such as a nuclear conflict. These planes feature aerial refueling capabilities, allowing them to stay airborne for days.