Piper PA-48 Enforcers. A valiant but forlorn attempt after their time, to redesign the basic North American P-51 airframe to a dive bomber/ground attack aircraft. The Piper PA-48 Enforcer (1971) is a turboprop powered light close air support/ground-attack aircraft built by Piper Aircraft Corp. Lakeland, Florida. It was the ultimate development of the original World War II North American P-51 Mustang. 4 were built.