Necessary Environmental Exemptions for Defense Act

This bill exempts the U.S. Department of Defense (DoD) and its contractors from key environmental review laws - including the National Environmental Policy Act, Endangered Species Act, Marine Mammal Protection Act, and Clean Water Act - for defense activities certified as countering threats from the Chinese Communist Party. It directly affects DoD readiness, training, infrastructure projects, and defense technology development when certified by the President or Secretary of Defense. The exemption eliminates mandatory environmental reviews or evaluations for these activities, prohibits substitute reviews by federal or state authorities, and retroactively cancels ongoing legal challenges related to such projects. The bill requires the DoD to review environmental best practices every five years but bars courts from reviewing or blocking certified defense activities.