To amend the Military Lands Withdrawal Act of 1999 with respect to extensions, additions, and revisions to the Barry M. Goldwater Range in Arizona.

HR 4377 extends the military withdrawal period for Arizona's Barry M. Goldwater Range until October 5, 2049, and adds approximately 2,366 acres in Maricopa County (the Gila Bend Addition) to the range. It revokes prior land withdrawals and transfers a specific mining claim to the U.S. Fish and Wildlife Service for management within Cabeza Prieta National Wildlife Refuge. The bill directly affects military operations at the Goldwater Range and land management responsibilities for the Fish and Wildlife Service. These changes ensure continued military use of the range while updating land boundaries and resolving prior land claims.