Built in 1972, the United States' F-15 Eagle was the most powerful fighter in the world and it would not be long before several allies of the United States would buy the craft and add it to their own air forces. Among them was Japan, which bought several then began to produce more under license in 1981 and they designated it as the F-15J.

While superb against human opponents, the F-15Js ran into difficulty against the kaiju threats during the late 1980's and 1990's.
Their first combat action would take place in 1989 when they sprayed iodine and other chemicals in the air in the hope that it would help activate the Thunder Countrol System (TCS) that they had waiting near Wakasa Bay for the ANEB (anti-nuclear energy bacteria) infected Godzilla.

Several years later, the F-15 would finally see combat action against the kaiju as a flight of six F-15J from Chitose air base confronted King Ghidorah as it devastated Japan's cities from the sky. Despite impressive bravery and skill on the part of the pilots, the 20th century fighters proved no match for the genetically engineered three-headed demon who swept them out of the sky with ease.

In their next combat action against the kaiju, they vainly attempted to stop the monster Battra with a hail of missiles and machine gunfire as it swam towards Japan although they suffered no losses to themselves.