Research into fusion for military purposes began in the early 1940s as part of the Manhattan Project, but this was not accomplished until 1951 (see the Greenhouse Item nuclear test), and nuclear fusion on a large scale in an explosion was first carried out on November 1, 1952, in the Ivy Mike hydrogen bomb test.
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On November 1, 1952, the Teller-Ulam configuration was tested in the "Ivy Mike" shot at an island in the Enewetak atoll, with a yield of 10.4 megatons (over 450 times more powerful than the bomb dropped on Nagasaki during World War II).
Hadley was the narrator of several Department of Defense films: "Operation Ivy", about the first hydrogen bomb test, Ivy Mike, "Military Participation on Tumbler/Snapper"; "Military Participation on Buster Jangle"; and "Operation Upshot-Knothole" all of which were produced by Lookout Mountain studios.
Detonated in 1953 with a yield equivalent to 400 kilotons of TNT (only 15%–20% from fusion), the Sloika device did, however, have the advantage of being a weapon which could actually be delivered to a military target, unlike the "Ivy Mike" device, though it was never widely deployed.