Fighter units of the Japan Air Self-Defense Force are squadrons of fighter aircraft dedicated to the defense of Japan. As Article 9 of the Japanese Constitution states that the country renounces war, JASDF fighter squadrons have never been deployed in combat overseas.
One of the main activities of JASDF fighter squadrons is providing Quick Reaction Alert intercepts to Chinese and Russian aircraft nearing or violating Japanese airspace. In 2016 Japan Air Self-Defense Force aircraft launched 851 times to intercept Chinese aircraft and 301 times in response to Russian aircraft.[1]
It has never been required to engage in combat to protect Japan. The closest the JASDF has ever come to combat was in 1987 when it fired warning shots near a Soviet Tu-16 that was violating Japanese airspace.[2][3][4]
As of 2019 there are 12 JASDF fighter squadrons in existence. In December 2013 it was announced that the number would be increased to 13.[5]
During the Imperial era the Japanese air services largely used Japanese fighter aircraft made by companies such as Kawasaki Aerospace Company, Mitsubishi Heavy Industries and Nakajima Aircraft Company. After the war surviving Japanese aircraft were mostly scrapped and aviation manufacturing capability was destroyed. When the new SDF's air capacity was initially established it was with surplus American aircraft left over from World War II.
When the JASDF's fighter capacity was to be re-established Japan had no capacity to design its own fighters, so US F-86F aircraft were purchased and Mitsubishi license-built 300 of them, along with the F-86D model.[11] In the postwar era Mitsubishi has been the main corporation responsible for Japan's fighters. In addition to the F-86s it also license-built F-104J/DJ, F-4EJ and F-15J/DJ aircraft. In addition it has designed and built the Mitsubishi F-1 and Mitsubishi F-2 aircraft.
The JASDF was interested in obtaining the twin-engine Lockheed Martin F-22 Raptor to replace the F-4 and F-15, but when this was not possible it settled on the F-35.[12][13] Mitsubishi is currently involved in assembling the F-35A.[14]
In addition to their fighters, JASDF squadrons also operate up to six trainer aircraft. Originally these were Lockheed T-33As, but from 1988 they were replaced by the Kawasaki T-4.
Mitsubishi also worked on the X-2 Shinshin as what many consider to be Japan's first stealth fighter.[15][16]
Squadron numbering
From the 1950s to the 1970s the JASDF's fighter squadron numbering system was based on the type of aircraft it was equipped with. Squadrons 1–11 were F-86F squadrons, 100 numbers were F-86D, 200 numbers operated the F-104J/DJ, and 300 numbered squadrons the F-4EJ. For fighter aircraft after the F-4 (the F-1, F-15J/DJ and F-2A/B) new squadron number systems were not introduced.
As the F-1 and F-2 were designated as fighters with a ground support role they were allocated to single-digit squadrons that formerly operated F-86F aircraft. The F-86Fs had also been designated as ground support fighters.