It's the sound of a classroom taken hostage. Volunteers acted as students and teachers. Officials instructing hostages to drop to the ground. Running drills; working to clear, search and secure the room.
"We want everyone to be on the same page - have the same tactics and techniques, concepts, so that everything can go together," said Benton County Sheriff's Deputy Mike Clark.
Deputy Mike Clark says teamwork for these scenarios is key.
"If this happens somewhere, we're going to rely on the resources of agencies within our region," added Deputy Clark.
Officials recognize the need to split responsibilities. Offering first aid to the injured and ensuring the room doesn't hold any hidden bombs.
"There's a lot more in the large-scale problems we're going to have with community with fire, medics," said Deputy Clark.
The training focused on methods to mobilize crews, and cohesively examine a hostage scene.
The last active-shooter threat was made in December - When the Mayan calendar end-of-the-world-rumors were flying around.
But beyond that, officials say there's never had a situation like Sandy-Hook.
"It's a scary situation for everyone involved. The victims, the hostages, the parents, those kinds of things," said Benton County Sheriff's Deputy Jerrad Jech.
Bringing control to chaos, if this disaster hits home.
Officials add most officials know basic concepts to control these scenes. But hope the methods learned this week will better coordinate searching for victims and controlling "bad guys." That's in case a hostage scenario ever strikes the local area.