The 5,000th Phantom was delivered on May 24, 1978, in ceremonies that also marked the 20th anniversary of the fighter's first flight, and McDonnell Douglas delivered the last St. Louis–built Phantom II in October 1979. By the end of production in 1985, McDonnell had built 5,068 Phantom IIs, and Mitsubishi, in Japan, had built 127. It served in the first line of more Western air forces than any other jet and was one of the most versatile fighters ever built.