It is claimed that the Nazi V-Weapons programs cost as much as the Manhatten Project and although the Germans pushed the limits of 1940s technology the weapons were strategic failures and only benefitted the conquering Allies and Soviets postwar with rocket development and spaceflight. It is claimed also that had they not built those weapons Germany could have purchased 48,000 Mk.IV tanks, or 50-60,000 piston fighters (depending on type), or tens of thounds of jet fighters, even hundreds of thousands of lesser rockets and missiles!!! Anyone that wants to read about Speer's frustration with duplication of effort, wasted RM on bad projects, and the SS refusal to work with him should read his book "Infiltration" (and yes, there is a note about the disc craft in there)!!!