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The F-15 Eagle was designed specifically to reprise the role of "dogfighter". To do this, the basic engineering was directed toward lower maintenance time by using less complicated systems. Maintaining the Eagle takes about half the time it takes for a Phantom, yet the F-15 retains essential automatic controls, such as engine inlet positioning. The single-seat F-15C is the second generation version of the single seat Eagle and replaced the F-15A in June, 1979. Externally, it shows little change, but inside it contains newer and more versatile electronics making today's Eagle far more deadly.