From the manufacturer:
The Mitsubishi F-1 is a single-seat attack aircraft that evolved from the Mitsubishi T-2 supersonic jet trainer. Its primary task in the Japanese Self Defense Force is anti-shipping with an air-to-air capability. The F-1 entered service in April 1978 and production ended in March 1987. 160 aircraft were planned, but only 77 were built. The F-1 had several upgrades to extend its service life. The F-1 has slowly been replaced by the Mitsubishi F-2 and upgraded F-4EJ "Kai" Phantom IIs. In 2006, six F-1s were retired.