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Its role was suppression of enemy air defenses during attacks, and a total of 28 EA-6As were built to fill this role. In addition to the standard attack variant, Grumman was ordered by the USMC to build a supplement and later replacement for the EF-10A Skyknight. DIANE consisted of a separate search radar and track radar, an inertial navigation system, an air data computer, a ballistics computer, a radar altimeter and a Doppler navigation system. The Intruder had an impressive array of advanced features, not found in other aircraft up to that date, namely a suite of electronics dubbed Digital Integrated Attack Navigation Equipment (DIANE). The second prototype flew on July 28, 1960, again with Robert Smyth at the controls. Five days later on April 19, 1960, the Intruder took to the skies for the first time, flown by Grumman test pilot Robert Smyth. The aircraft was fitted with only the equipment needed for safe flying. Since this was before the branches of the US military unified their numbering schemes, it was designated A2F-1 Intruder. The very first Intruder rolled out of Grumman's factory in Bethpage, Long Island, on April 14, 1960. On JanuGrumman's design was declared the winner, and on FebruGrumman was awarded a contract for initial design work and a full-scale mock-up. The three shortlisted proposals were from Vought, Douglas and Grumman. Because of the intended nature of Intruder missions, no provision for a cannon was fitted. Weapons would be carried on four wing pylons and one on the fuselage centreline. The design also had foldable wings to ease storage aboard carriers. Grumman's original design had one unique idea the jet pipes could be deflected up to 23 degrees downwards in order to shorten take-off lengths. Grumman submitted their design number 128Q, a side-by-side two-seat jet-powered subsonic aircraft, utilizing two Pratt & Whitney J52 non-afterburning engines. Proposals were submitted by Boeing, Grumman, Douglas, Lockheed, Bell, North American, Vought and Martin by the August 1957 deadline set by the US Department of Defense. In February 1957 the US Navy requested proposals for a two-seat all-weather capable aircraft that could operate from short runways and within a 300 nautical mile / 556km radius. The Grumman A-6 Intruder was born out of the need to replace the Douglas AD (later A-1) Skyraider attack aircraft in both the US Navy and the US Marine Corps. 42 years after the first prototype flight it is still up there, although very much has changed under its grey aluminium skin. The Intruder has one of the longest service records of any aircraft in the US Navy and the US Marine Corps.