Sure-Fire is a company that makes flashlights and weapon lights and provides tactical training for low-light conditions.
The lights available include laser sights, infrared lights, visible lights and they are made as modules to fit into the mount that you can attach to a rifle, carbine, shotgun, pistol or other handgun if you are so inclined.
Somebody owning a Sure-Fire light is very likely to own a leatherman multi-tool and a pair of gore-tex boots.