The YF-16 and YF-17 were a result of the victory by the Israelis in the 6 Day War in 1967 using Day VFR fighters. We had a competition to come up with our own DVFR fighter, and the YF-16 and YF-17 were the result. The problem was, that by the 1973 Mid East war, we found out the day of the Day...