the continental tests considered in section 4.20. The DOMINIC shots, also named Operation SUNBEAM by DOD, were the last atmospheric nuclear weapons tests conducted by the United States (23: 1). DOMINIC I consisted of the 36 nuclear tests identified in the accompanying table. Most of the shots were detonated in the air after having been dropped from B-52 bombers. Twenty-four of the airdrops took place from 25 April through 11 July over the ocean just south of Christmas Island, United Kingdom territory 1,200 nautical miles south of Honolulu. Five more airdrops were detonated in October over the open ocean in the vicinity of Johnston Island, U.S. territory 780 nautical miles west-southwest of Honolulu. The five rocket shots, designated FISHBOWL events, were launched from Johnston Island and detonated at high altitudes, up to 400 kilometers. other two shots: The Navy conducted. the FRIGATE BIRD, launched by a Polaris missile from the sub- marine USS Ethan Allen and detonated east of Christmas Island; and SWORDFISH, a rocket-launched antisubmarine nuclear depth charge detonated 400 miles west of San Diego (23: 1,2). Figure 16 shows the SWORDFISH spray dome and the USS Agerholm (DD-286), from which the rocket was fired (I). 4.19.1 Background and Objectives of Operation DOMINIC I. The U.S. did not conduct any nuclear tests from 30 October 1958, the date of the last HARDTACK II test, to 15 September 1961, when the U.S. resumed underground nuclear testing at the NTS. On 1 November 1958, the U.S. initiated its 1-year suspension of nuclear testing, which was later extended throughout 1959. On 29 December 1959, the U.S. announced an end to its moratorium, effective 31 December, but with a promise not to resume testing without advance public notice (23: 25). On 3 January 1960, the Soviet Premier pledged that the Soviet Union would not conduct nuclear tests unless the Western nations resumed their testing. On 31 August 1961, however, the U.S.S.R. abruptly announced plans to resume atmospheric testing and then detonated a nuclear device at the Semipalatinsk test range in Central Asia the next day. This began an extensive Soviet series that continued into November and included more than 30 nuclear shots, among which were a 58-megaton detonation (the largest ever) and high-altitude tests. U.S. testing recommenced with a tunnel shot at the NTS, 15 September 130