In 1956, the [[United States Navy]] ordered the [[A-6 Intruder]], which entered service in 1963. The Navy was so pleased with the all-weather attack aircraft that it ordered an electronic countermeasures version in 1963. A prototype version of the EA-6A was flown in 1963, and the [[Marine Corps]] ordered 27 of these airplanes. The first version was little more than a modified A-6 with radar equipment and two extra seats. | In 1956, the [[United States Navy]] ordered the [[A-6 Intruder]], which entered service in 1963. The Navy was so pleased with the all-weather attack aircraft that it ordered an electronic countermeasures version in 1963. A prototype version of the EA-6A was flown in 1963, and the [[Marine Corps]] ordered 27 of these airplanes. The first version was little more than a modified A-6 with radar equipment and two extra seats. |