Can't help with the question, but why would you want to?

Unless you want to forfeit your free bennies and sell your leave, you are really not giving yourself enough time unless you give at least 4 months notice. Assuming you have 60 days or more leave like everybody seems to have these days (because you can't use it all even if you wanted to), add in the 20 free days permissive TAD (10 for househunting, and 10 for interviews) TAP class, medical eval, etc, and add in time for admin to actually process the paperwork, you're looking at 3-4 months time easy if not more. Add in the fact that you still have to actually work while you are outprocessing until you go terminal and 6 months from actual date of separation (not the date you go terminal) is really almost not enough time to do everything you need to do before separating.