For Thanksgiving (or other 72/96 hour holidays) if you submit an out-of-bounds/special liberty chit, it doesn't count as leave (as long as you're not missing any work), and you're not eligible for watch. For example, I just got one approved for noon next Wednesday through that Sunday, to go home for turkey day. No leave charged. Christmas is a special case, since it's not one long liberty but a few of them with duty days thrown in, but this works most of the time.
Just FYI...It's all well and good that you are getting that deal, but for the record, that's not a legal special lib chit. You've got a 120 hour lib chit there, which is more than an O-6 can authorize. Not a big deal unless something bad happens while you're gone.