rigs32, I would definitely call and ask! I know that the tickets have to be bought at WDW, and you have to show the military member ticket to purchase the discount tickets. Also, I don't know where you are staying, but they have some great room rates. I booked CSR at $93.24/night, including tax, for 6 nights. You can book for 6 nights max at the discount rate, since it is a 7 day pass. I wanted 2 additional nights, and the CM told that it would be $205.00/night with tax for the extra nights, so we will stay off-site at the beginning and the end.
When you call, make sure the CM understands that your DH will be going active right after you return from WDW. If the CM doesn't give you the special, I would very politely ask for a supervisor, and keep going up the chain until they give it to you. I think they would be very understanding about the fact that you are trying to get in some family time prior to activation.
Good luck!