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In the very beginning of the "Blowtorch and Corkscrew" campaign mission there is a glitch on all of the trapdoors used by the banzai attackers. This is it:
If you kill one of the banzai attackers before the come out from under one of their trapdoors, and you go prone on the top of it, you will fall through the top and be invisible to the enemy. You can't see out, but you can hide and they won't shoot at you. It's pretty helpful if you need to get to cover.
**It can also be found on other missions with those trapdoors**