While I'm not going to comment on the recolections of men who fought a war 50+ years ago I have seen some references to how useless it is to attack a tank with machine guns.
Not so! It's not the dammage that matters. For the price of a few rounds it tells those in the tanks that "Your Air Force is powerless to stop us. We own the Sky. You are alive right now because we don't have any bombs. We will be back tomorrow, and then your war will end"
Those men in the Panzer's new this all too well.
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CO - 111th Fighter Group