In January 1950, President Harry Truman, despite strong reservations of the Atomic Energy Commission, made the controversial decision to intensify research and production of thermonuclear weapons.
On May 12th, 1951, the United States, detonated the first hydrogen bomb on Eniwetok Atoll in the Marshall Islands.
The bomb was based on the combination of a nuclei of heavy hydrogen (deuterium) and the process of fission.
Operation Greenhouse was designed to reduce the size, weight and amount of fissile material necessary for nuclear weapons, while increasing the destructive power.