The McDonnell Douglas F-15 Eagle, after more than 25 years of service, was still the U.S. Air Force's premier fighter as the year 2000 approached. The F-15 constantly is upgraded to include state-of-the-art equipment. It can penetrate enemy defenses and can outperform and outfight any current or projected enemy. The Eagle's air superiority is due to its advanced avionics, its range and weaponry, and its unprecedented maneuverability. One person can effectively perform air-to-air combat using its advanced systems to detect, acquire, track and attack enemy aircraft.