The document discusses how the 1999 National Nuclear Security Administration Act threatens to reverse decades of environmental reforms at US Department of Energy nuclear weapons facilities by potentially shielding the NNSA from enforcement of environmental laws. It established a semi-autonomous NNSA agency within DOE to operate nuclear weapons facilities. Some argue this language erodes existing waivers of sovereign immunity in environmental laws, which could effectively prevent the NNSA from being subject to environmental regulation and enforcement. This would reverse progress made over the last 20 years to bring DOE facilities into compliance with environmental laws and address massive environmental cleanup costs resulting from decades of lax oversight and regulation when the facilities were operated in secrecy by DOE predecessors.