50 RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL Description and History: 1526-1972 51 FIGURE 4-50. THE ISLAND CHAIN AND CRATER AFTER EVENT MIKE. effects and caused the United States to enlarge the oceanic area in which fishing and shipping would be excluded .84 OPERATION REDWING: MAY-JULY 1956 FIGURE 1-49. EVENT MIKE FACILITIES ON ELUGELAB, LIDILBUT, BOKAIDRIKDRIK, AND BOKEN. In 1953, the United States had established the pattern of testing in the Pacific and in Nevada on alternate years. This was continued in 1956, when ll of the 17 shots of Operation Redwing were fired at Enewetak and the other six were conductedat Bikini. Most of the yields from this series were classified and only the Seminole Event at [3.7 KT and the Lacrosse Event at 40 KT were announced. Of the Enewetak events, two were carried out on island surfaces, six were tower shots, and two were barge shots. Additionally, the first air drop of a thermonuclear bomb was executed, with a yield of several megatons. The Redwing series at Enewetak extended from 4 May to 21 July 1956. NReee (Irene) Island in much the same manner as Mike removed Elugelab. The other surface shot was Lacrosse, which formed a large crater on the northern reef of Runit. The shot tower on Aomonfor Event Kickapoo of the Redwing series is shown at Figure |-SI.