The U.S. successfully tested a tactical thermonuclear gravity bomb using inert warheads in August, according to a research and development arm of the Department of Energy's (DoE) National Nuclear Security Administration (NNSA). The exercise was part of a stockpile reliability assessment, according to an official press release . Conducted August 19–21 at the Tonopah Test Range in Nevada with support from Hill Air Force Base in Utah, it involved fifth-generation F-35A fighter jets carrying and