Sometimes, retirement isn’t permanent. Here's What You Need to Remember: In fact, the U.S. Air Force did eventually buy a propeller-driven counterinsurgency plane. Brazil's A-29 Tucano was selected in 2011 for the new Light Air Support contract. There are twenty aircraft on order. The North American P-51 Mustang was one of the greatest fighters of World War II. Had life worked out differently, the Mustang could also have fought in Vietnam and flown against a Soviet invasion of Western Europe. In fact, it might even have replaced the A-10 Warthog. The Piper PA-48 Enforcer was a modernized version of the P-51. It was the brainchild of David Lindsay, founder of manufacturer Cavalier Aircraft, who bought the rights to the Mustang in 1956.