The outdoor siren system -- including all county sirens in Laramie, Rock River, Centennial and Albany -- is tested at 10 a.m. on the first Friday of each month.
Officials are also asking folks to help those without internet access get signed up and to make sure family, friends and neighbors have entered their information.
In addition to the three Laramie firefighters, three Laramie police officers responded along with one Cowboy Aviation employee and one Albany County Central volunteer arrived in a personal vehicle.