The inadvertent disclosure of a U.S. Air Force F-117A technical manual specifying hazardous byproducts of burning wreckage has rekindled the hopes of plaintiffs seeking compensation for injuries and death from alleged exposure to toxic fumes at a secret government facility.

The widows of civilian employees Robert Frost and Walter Kasza and several surviving former co-workers tried unsuccessfully for more than a decade to make the Air Force tell them what substances they were exposed to while working at a classified facility in southern Nevada that the Air Force refers to as “an operating location near Groom Dry Lake.”