Since the Enforcer was never in the Air Force inventory, it was not given an official military designation and did not receive an Air Force serial number. It carries the Piper designation PA-48 and Federal Aviation Administration (FAA) resistration number N481PE.
Piper PA48 Enforcer
The Enforcer is a turboprop-powered light close-support ground-attack aircraft built by Piper Aircraft Corp. Lakeland, Fla. It is based on the well-known North American P-51 Mustang. Testing was conducted in 1984 and the Air Force decided not to order the Enforcer.