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The danger of being mind controlled, or at least influenced, could be used as a reason there aren't many aliens on the field. Any direct contact with an alien could be dangerous, due to revealing secrets about the base of operations, or because the soldier could be otherwise influenced. Then after a mission, this same reason can be used as to why soldiers need to rest; not only physically, but mentally. They also need to be rescreened to ensure that the aliens did not alter their beliefs or whatnot. I'm thinking it's a really potent device that could up the fear factor of aliens, and made to lamp-shade a lot of minor details.