Was down here for their US Army Rangers Tactical Sim Evolution training event, held in conjunction with CoreTac. Basically a humongous CQB field in a giant warehouse in Rancho Cucamonga. Great training, amazing playing field layout with tons of rooms, each designed to mirror a type of room(ex. kitchen, living room, bedroom, office), and plenty of room and variety to keep a day of airsofting fresh and fun. Reasonable rates on rentals and entry too. I would also highly recommend looking into the Tactical Simulations Evolution events that are held there, in conjunction with CoreTac(shameless plug). I’m currently training for the US Army National Guard, and even I learned a few new tricks during the US Rangers event. Only reason it gets 4⁄5 stars is the drive — I live at Santa Ana, and if it wasn’t almost an hour away, I’d probably be coming here at least once every every week.