Double check
Mike Brumer, Aerospace Testing Alliance’s Hazardous Material Operations Manager for Arnold Engineering Development Center, checks the security of the valve caps on pressurized bottles of hydrogen gas stored in a cylinder yard on the base. He and his five-member team are responsible for the safe procurement, transportation, storage, use and dispensing of a broad array of hazardous materials on base. These include aviation fuel, heavy and light oils, explosives and munitions, and ozone depleting substances. (Photo by Philip Lorenz III)