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In page Grumman E-2 Hawkeye:

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Two E-2A test machines were modified as E-2C prototypes, the first flying on 20 January 1971. Trials proved satisfactory, and the E-2C was ordered into production. The first production aircraft performed its initial flight on 23 September 1972. The original E-2C, known as Group 0, consisted of 55 aircraft; the first aircraft became operational in 1973 and began serving on carriers in the 1980s and 1990s, until they were replaced in first-line service by Group II aircraft. The US Navy Reserve used some aircraft for tracking drug smugglers. The type was commonly used in conjunction with Grumman F-14 Tomcat fighters, monitoring airspace and then vectoring Tomcats over the Link-4A datalink to destroy potential threats with long-range AIM-54C Phoenix missiles.[citation needed]