Thank you for your service.
I have been to camp many times, I think this year or last year was the first time they require tickets for admission. Hopefully you already got your tickets.
They allow you to bring in small coolers, I recommend one, with a couple lawn chairs. (There are open areas to sit with closer views than the bleachers.
They do sell Water/Soda and hotdogs, typical small vendor foods. The last time I went maybe 5 years ago, it was reasonable (Like $4.50 for a dog)
The sun can be brutal so bring plenty of water. There is a kids area that is free and at the end of camp when the players come around for autographs make sure you have something for them to sign and sign with. There is a gift shop with tons of cool apparel and hats etc... If your kids are young, you can usually hold them up and players tend to sign for the kids before an adult alone.
All in all its a cheap way to spend the day if your family enjoys the Bears. My daughter lost interest quickly when she was 7 and kept asking if we can go now...
Enjoy and Post lots of pics....