"Program 477L"@en . . . . "Program 477L (477L), also known as NUDETS (NUclear DETonation System) was a Cold War-era system used to monitor nuclear detonations over the Continental United States."@en . "Program 477L (477L), also known as NUDETS (NUclear DETonation System) was a Cold War-era system used to monitor nuclear detonations over the Continental United States."@en . . . .