There is definitely discounts for Disney and Universal for MILITARY.
My husband is retired and is now a Reservist.
We are going with the Universal/IOA two day pass. Normally, 95.35 - we're paying $88 NO TAX. Not a huge savings but with the discounts for our 4 day WDW hopper -the savings add up.
If you go to shadesofgreen.org you can click on Theme Park Tickets and get a complete breakdown of what and how much. Shades of Greenn is the deluxe resort right IN Disney for military and prior military personnell only.
The web site is just for this resort but you DON'T have to stay there to get the benefits. No tax in their souvenir shops, restaurants, etc. (It's owned and operated by the Armed Services Recreation Center).