Not very often though
I have conducted many paranormal investigations at Ft Reno. My team and I also were the first ones to investigate the location and help with the ghost tours for two years before anyone one else did. I can tell you there is activity there but greatly deminishes during public tours. Personally I have witnessed several full body apparitions in different locations during our investigations while in some of the old structures.
It is now impossible to conduct proper investigations there. I do miss the place to be honest. I capture many EVPs and some interesting photos. you can find them on my site at prosinvestigations.com