herod: FD.2: Mirage. It's another we wuz robbed myth. I take it you allude to FD.2's Cazaux trials, 10/56 where that nice Marcel "copied" it. But Mirage III prototype was rolled out 2 days after FD.2 left. If AMD picked any brains they were German...but they didn't. ONÉRA (the French RAE) based a multi-role platform on a delta, and paid AMD to do it.
Late-1942 US offered licence-built Vickers B-29. We chose to attempt Vickers Windsor, and to buy (Abraham) Lincoln. Early-1948: US intending to pull all GIs out of W.Germany before Presidential Election, 11/48: everybody knew Truman would lose and isolationist Republicans would laager into Little America. Uncle Joe knew this too, so tried to take W.Germany painlessly, starting in Berlin, 24/6/48. He feared not Lincoln. He did fear Tu.4 Bull (aka B-29). If a Wing of Vickers 441 had then been sitting on Marham, he might not have caused the Airlift, so causing UK to define a Soviet Threat and start the build up of 1950s' Forces, thus the Cold War.