Born in the midst of Cold War secrecy, the Savannah River Site (SRS) has always operated safely and efficiently to execute its missions. During the Cold War, it produced one third of the nation's weapons-grade plutonium and all of the nation's tritium-both integral components of nuclear weapons.When the Cold War ended, the United States no longer needed the amounts of new nuclear materials as before and a new focus began-on cleaning up the Cold War legacy and downsizing the nation's nuclear complex. Other nuclear sites across the nation were closed down, and their materials were sent to South Carolina for safekeeping because of SRS' security excellence and unparalleled history of safety performance. Now SRS, and a handful of other sites, have became the bedrock of the United States' nuclear future.