Used to love those, pro tip, you can buy more than six a year, just go to
another MWR at another base. Nobody outside the MWR tracks them, although I don't think the ticket takers will let more than 6 a day through at the park. Seal Beach is the closest one to the park I believe. For single day, you can get as many as you want, but it's only the slight standard group discount. The multiday park-hoppers are where you really get an incredible deal, and those require at least a single active duty or retired id at first park entry to activate. If you bring friends and they decide to use the other days at a later time they can get through the gate without you if the ticket has already been activated with you the first day.