[Pooch]

F-51 is a P-51. There is no difference in the airplanes. Shortly after the Army Air Forces became the U.S. Air Force , in 1947, they changed the designation for fighters from P, for persuit, to F, for fighters. That's it. The Mustangs kept their old Browning Point Oh Fives and soldiered on until the were declared obsolete after the Korean War.