Canwe just show up or do we need to fill something out in advance to get to the paintball park?

You can walk in Friday though Sunday. Any other day you have to make a reservation. Also, there an online waiver you need to digitally sign. They have stations to do it there or you can do it anytime same day on their website

As of August 2021, you have to get a visitors pass at the main gate in order to get access to the base unless you know someone in the military that can sponsor you on. Other than that you can just show up. they do walk-ins on Friday Saturday and Sunday for paintball

We made no res. Walked right on.