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Operation Ranger carried out the first tests in the United States proper since the Trinity test in 1945. It was proposed during technical discussions at Los Alamos on 6 and 11 December 1950. Approval was requested by LASL Director Norris Bradbury on 22 December, Preidential approval was received on 11 January 1951. The first Ranger test shot was 16 days later. All five were fired in just eight days.

Source: nuclearweaponarchive.org

Able

1 kilotons
Nevada Test Site
27 January 1951

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