Today, the lab has six chambers. Two of the most extreme rooms were added in the early 1970s to meet the military’s global portfolio. In the Salt Test Chamber (50 feet by 16 feet wide, and 16 feet tall), technicians can spray metal-eating sodium chloride to test for corrosion resistance. The Sun, Wind, Rain and Dust Chamber (50 feet by 50 feet, and 30 feet tall) has fans that can blow 40-mile-per-hour sandstorms, the kind you see U.S. Army grunts in Afghanistan posting on YouTube. And to better simulate doing time in a Middle East gulf state, techs can switch on heat lamps set as high as 165 degrees to bake tanks, radar systems, missile launchers, aircraft tugs, and Army transports. The crew at McKinley recently vetted a new Army generator that will sit outside “little tent cities,” says Bell, to power air, filtration, and electrical systems.