When are you planning to travel? The Disney Armed Forces Salute includes retirees. For 2017, there is a ticket option for a 5 day Park Hopper ticket. Also, Disney resort hotels have discounts (how much depending on value/mod/deluxe). I'm not sure what rate category you fall into at Shades of Green, but it may be cheaper to stay at a Disney resort hotel using the Armed Forces Salute. As mentioned above, there are certain blackout dates.
Also if you can, buy your ticket vouchers before you arrive. Buying from any ITR office on post will save you the sales tax. You can link them to your My Disney Experience so you can make your FP+ reservations in advance (60 days if staying in a Disney resort hotel). Then you just have to take them to Guest Services and activate them at Disney Springs or one of the theme parks.
I hope this information is helpful to you.