<Li> 1953 - The first nuclear - tipped rockets are deployed by the United States . The MGR - 1 Honest John is such as example . </Li> <Li> 1953 - August - The Soviet Union conducts its first test of a hydrogen bomb, nicknamed Joe 4 by the Americans . </Li> <Li> 1954 - February - The United States detonates its first deliverable thermonuclear weapon at Bikini Atoll, Marshall Islands . The device had a yield almost three times as large as expected, leading to the worst radiological disaster in US history . </Li> <Li> 1956 - France establishes a secret committee for the Military Applications of Atomic Energy . </Li>

What type of nuclear bomb was developed by the united states in 1954