The bombing of Japan, the Soviet’s “First Lightning” test, and America’s H-bomb detonations were powerful signs that the Nuclear Age was upon us. But as recently declassified files reveal, explosive events were also carried out in secret.

While the world was captivated by NASA’s Apollo moon missions in the 1960s, the U.S. military was developing a parallel space program, an orbiting spy station that would gather high-res photographs of Soviet weapons systems.

The Cold War was a constant threat to the U.S. and Soviet Union throughout the second half of the 20th century. Learn how the U.S. military produced secret films with Hollywood, using its state-of-the-art studios, equipment, and even Marilyn Monroe.