Double V, Double V Too ! : the OTHER Manhattan Project

It took a hell of a long time - almost an entire war in fact, before the Allied leadership (at least the NEW DEALER portion of it) accepted that Allied and Neutral citizens weren't going to fully support the Allied military effort until they saw proof the Allies were actually as different from the Axis as they had long claimed.

I believe that moment began when the US government and military bombers began flying abundant amounts of naturally-grown penicillin all over the world, to save Allies & Neutrals "4Fs and quasi 4Fs" dying for lack of it.