You have to go with a bio-weapon, possibly injected into the hostages that were taken when Pahute Place was overrun by Krell, you can theorize that two or more types were used so that there was a greater chance of spread, but then you run into the universal antidote issue, why didn't IT WORK!!!???
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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