The McDonnell-Douglas F-4 Phantom was a legend with over 50 years of service with the United States (yes, this included its service as a target drone). But every classic design has been inspired by something somewhere in the past.
CF-101 Voodoo. (Wikimedia Commons photo by Bzuk)
The F-101 was a classic plane. It entered service in 1957, and was still in some Air National Guard units in 1983 — a 26-year service career in the United States. The plane's long range made it a good fit for Canada as well. The Republic of China on Taiwan also acquired these planes. You can see more about this long-serving inspiration for the F-4 below.