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The E-4B, also known as NAOC (National Airborne Operations Center), is a Boeing 747 aircraft refitted to serve as a command post for the United States armed forces during a nuclear war. For this reason, E-4Bs are sometimes referred as "the doomsday planes." Four are currently operated by the United States Air Force, and are assigned to the 55th Wing at Offutt Air Force Base, Nebraska. Maintenance and crews are provided by Air Combat Command, while operations are coordinated by Strategic Command .

The NAOC fleet was originally deployed in 1974, when it was known as NEACP (National Emergency Airborne Command Post). It was originally stationed at Andrews Air Force Base in Maryland, alongside Air Force One, so that the President and Secretary of Defense could access it quickly in the event of an emergency. Later, the aircraft were moved to the Midwest, where they would be safer from attack but still accessible by helicopter. One E-4B is kept on full alert at all times, and one remains relatively close to Air Force One so that the President can access it quickly from anywhere in the world.

In 19941994 is a common year starting on Saturday, and was designated the International year of the Family''. Events January events January 1 North American Free Trade Agreement (NAFTA) goes into effect January 6 Nancy Kerrigan is clubbed on the right leg by an, NEACP's name was changed to NAOC, and it took on a new responsibility: ferrying Federal Emergency Management AgencyThe Federal Emergency Management Agency or FEMA is an agency of the United States government dedicated to swift response in the event of disasters, both natural and man-made. FEMA coordinates the work of federal, state, and local agencies in responding to crews to natural disaster sites and serving as a temporary command post on the ground until facilities could be built on site.

The E-4B, which replaced the older E-4A in 19801980 is a leap year starting on Tuesday. Events January-February January 1- April 1 National steel strike in United Kingdom January 1 Changes to the Swedish Act of Succession creates Victoria of Sweden, Crown Princess over her younger brother January 5 He, is specially modified to weather nuclear warfare conditions. Its computers and communications systems are shielded from electromagnetic pulseEMP redirects here. The initials EMP also stand for Experience Music Project EMP is also a type of intermodal container used in international freight shipping In telecommunication, the term electromagnetic pulse (EMP) has the following meanings: # The ele, and its air conditioningNote: in the broadest sense, "air conditioning" can refer to any form of " heating, ventilation, and air-conditioning. This article is specifically about the use of refrigeration for this purpose. The first album of the pop group Curved Air was Airconditi system is specially modified to block radiation.