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Many of the Wehrmacht's soldiers were high on Pervitin when they went into battle, especially against Poland and France -- in a Blitzkrieg fueled by speed. The German military was supplied with millions of methamphetamine tablets during the first half of 1940. The drugs were part of a plan to help pilots, sailors and infantry troops become capable of superhuman performance. The military leadership liberally dispensed such stimulants, but also alcohol and opiates, as long as it believed drugging and intoxicating troops could help it achieve victory over the Allies. But the Nazis were less than diligent in monitoring side-effects like drug addiction and a decline in moral standards.
http://service.spiegel.de/cache/international/0,1518,354606,00.html
Actualy already Zeros met Spitfires over Singapore ...and shot them down imediately (as was wroten by Australian pilot there)Certainly against the British forces the Japanese aviation went against second hand and out-dated equipment. The IJAAF or IJN didn't meet the Spitfire until 1943!