Aww, c'mon, it's OBVIOUS that the advisors are red-necked farmers! Imagine those things on a porch with a Banjoe and Harmonicca? (ooh, I spelled that wrong)
MY mistake, but I would like to point out that maybe, or eventually, instead of assimilating mature humans, the combine will grow them on farms, and then enhance them as military uses in whatever way they please. It would be interesting to come across a combine baby farm.
Perhaps the advisors BUILD offspring, without the need for any biological reproduction what so ever. Kinda like the scientist in Edward Scissor hands...