Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Boeing E-3 Sentry is an American military airborne warning and control system aircraft based on the Boeing 707 that provides all-weather surveillance, command, control and communications, to the United States, the United Kingdom, France, Saudi Arabia, and NATO air defense forces. It is distinguished by the disc-shaped radome above the fuselage. Production ended in 1992 after 68 had been built. In June 1965, the United States Air Force asked for proposals for feasibility studies into the provision of an Airborne Early Warning and Control system to replace the Air Force's existing EC-121 Warning Stars, which served in the Airborne Early Warning role, taking advantage of improvements in radar technology which allowed airborne radars to "Look Down" and detect low flying aircraft, even over land, which would previously be undetectable due to ground clutter. Contracts were given to Boeing, Douglas and Lockheed, with Lockheed being eliminated in July 1966.

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