Against a backdrop of lush trees, paintball players belly-crawl through gigantic concrete pipes, wade waist-high through wetlands, and pop off rounds from behind disabled Army jeeps. The battlegrounds are so elaborate, in fact, the Butte County sheriff's office and SWAT teams train on them, using the wooden huts as cover and the large tin barrels as the rhythm section for their reggae bands. Citizen players 10 and older, however, navigate the obstacles during fast-paced woodsball and speedball matches as referees monitor to ensure fair play. There's even a field specifically for target practice so gamers can knock the rust from their muzzles. Meanwhile, lights emblazon the speedball field during night matches of adrenaline-fueled play.