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 military uses the Boeing 747 extensively, though they are modified into highly specialized variants rather than standard troop transports. The most famous is the VC-25A, widely known by its call sign "Air Force One" when the U.S. President is on board. There are currently two VC-25A aircraft (highly modified 747-200Bs), which are being replaced by the newer VC-25B (based on the 747-8) starting in the mid-2020s. Another critical military variant is the E-4B "Nightwatch," also known as the "Doomsday Plane." This is a militarized 747-200 designed to serve as a mobile National Airborne Operations Center in the event of a nuclear attack or national emergency, featuring shielding against electromagnetic pulses (EMP). Other nations and agencies have used 747s for specialized roles as well, such as the Shuttle Carrier Aircraft used by NASA or various "tanker" and experimental laser-test platforms (like the YAL-1). While the 747 is retiring from commercial passenger service in 2026, its "Queen of the Skies" status remains secure in these vital, heavy-duty military and government roles.