highly modified version of the Cavalier Mustang ll for use as a counterinsurgency aircraft called the Enforcer. Powered by a Rolls-Royce Dart and later a Lycoming YT-55-9 turboprop of , the aircraft had impressive performance and was equipped with Bristol ceramic armour to protect the engine, airframe, and pilot. Despite Cavalier's best efforts, they were unable to secure a government purchase of the aircraft. Due to the limited manufacturing capabilities of Cavalier Aircraft Corporation, Lindsay sold the Enforcer project to Piper in late 1970. Cavalier was closed in 1971 so the founder/owner, David Lindsay, could help continue develop the Enforcer concept with Piper Aircraft into the PA-48 Enforcer. Today Many of the civilian Cavalier conversions are still flying today. Several of the military Cavaliers have been re-imported to the US. Most have been restored to appear as WW II or Korean era P-51s, but retain many of their Cavalier improvements. References External links Cavalier P-51 Architect Lindsay dies at 86 Outsider David Lindsay May Have Built a Better Fighter, but the (Air) Force Is Not with Him Defunct aircraft manufacturers of the United States Vehicle manufacturing companies established in 1957 Vehicle manufacturing companies disestablished in 1971 1957 establishments in Florida 1971 disestablishments in Florida