I think "Operation Salute" is still going at the Busch parks (ie Sea World & Busch Gardens). All I did was pitch up at the gate, show ID and complete a form. Rather than go all the way out to Patrick / Canaveral you could go to the Navy PX, on Earhart Drive (next to MCO). There is a large MWR section there, as well as all the obvious PX attractions! You can E-Mail them before you go to get the latest discounts, so you can budget. You don't get much off Disney (5-10%) but you can get some excellent prices for water parks, dining shows, Kennedy and other museums. If you can get away from the family, go to Kermit's Fantasy of Flight and, on your way to Kennedy, drop in for an hour at the Valiant Air Command museum.
Have fun, PM me if you want any extra advice.