The F-15 has often been labeled as the greatest fighter aircraft in the world from the 1970s until the early 21st century. Designed to counter the exaggerated capabilities of the Soviet MiG-25 "Foxbat", the F-15 has been the backbone of U.S. air defense for three decades. The F-15C, equipped with improved avionics and weapons over the original F-15A, has scored over 100 air-to-air victories in the service of Israel, Saudi Arabia, and the U.S. without suffering any losses.