The former name of F-20 Tigershark was the F-5G, indicating that it was a development of a single engine F-5. The F-20 had 80% more engine power, modern avionics and a wide wing. it was a capable aircraft but found no customer, because the USAF preferred to stick with the F-16. That also was offered to the USN in the "aggressor" role, but was rejected once again in favor of the F-16. No market there was little hope for export orders.