Hi there, Gretchen!
Thanks so much for stopping by the Disney Parks Moms Panel with your great question. Also, I'd like to extend a thank you to your family for your military service. Disneyland Resort has always been committed to supporting military families with their fantastic ticket and hotel offers.
Our family has also been fortunate to utilize the
specially priced theme park tickets for U.S. military families the past few years, and we are so thankful. Once you enter the park and link your official park tickets to the
Disneyland app, you are most definitely eligible to purchase the
Disney MaxPass add-on for your ticket. Keep in mind that you will have to do this each day you enter as it is a daily feature per Guest. Once we had some issues adding Disney MaxPass due to technical difficulties, but we were able to head to Guest Relations at the park where they manually added it for us. I suggest also doing this if you have any trouble adding Disney MaxPass after you arrive. Keep in mind that Disney FASTPASS selections using Disney MaxPass can only be made once you scan your tickets in the gates each morning, but after that you can make your selections from anywhere in the Disneyland Resort.
I hope this helps, and please return if you have any other questions as you plan your next magical family vacation. Have a Fantasmic day!
-Jennifer