MJ:
I agree that Disney's Armed Forces Salute is quite an offer! I wish I could get my brother-in-law over from Fort Hood to take me and my family!!
According to
the rules of the offer, it looks like it cannot be combined with any other ticket offers and that leads me to believe you won't be able to add additional theme park days.
However, if this is confirmed when you pick up your tickets, I would recommend you upgrading to the Water Parks & More Option for sure. For the price of $25 per ticket, it's a steal! You'll get 4 visits any of the following: Blizzard Beach, Typhoon Lagoon, DisneyQuest or a round of golf at Oak Trail. You could spend a separate day at each of the water parks and then another at DisneyQuest and Downtown Disney. Leave the last visit for another trip to whichever was your favorite.
I usually don't recommend the Park Hopper option, but in this case, it's a good deal for $5 a day. That way, on the day you visit Animal Kingdom and it closes early, you can go back to Magic Kingdom for the fireworks!
Thank you for serving, and have a magical vacation!
Whitney