>>63849102 (OP)Simple. If the liaison attached to your unit tells you to do something, you fucking do it. No matter what it is, you do it. Don't run it by the LT first, don't object to it on religious grounds, just do it.
Don't bother with night vision. Anything that shows on thermal isn't worth worrying about and if everyone's running around with nods on, it won't have any trouble at all disguising its true eyes. Obviously, sentries should be posted in threes and don't rely on countersigns, if they really want it they'll get it out of you whether you're still breathing or not.
And if morning comes and the headcount is one short... trust me when I say you can learn to live with that, eventually. It's when everyone is present and accounted for that you should start sweating.