I believe they make you choose one or the other if I remember correctly. I can't remember the exact details of both but I ended up using post 9-11 (private thru comm). It took just under a year at an approved school. I'm not sure how much benefit I burnt up, you should contact a school you are looking at and ask for the veterans office..they should be able to fill you in on all the exact details. As far as atp goes idk, I would imagine you burn up a lot more benefits than say going through some university or tech school....