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Ellsworth AFB Defense Area

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Four Nike Ajax batteries were positioned around Ellsworth AFB in 1957: E-01 was north, E-20 was east-northeast, E-40 was south-southeast, and E-70 was west-southwest. Headquarters facilities were located at Ellsworth. In 1958, batteries E-20, E-40, and E-70 were removed from service and E-01 was converted to fire Nike Hercules missiles. This battery remained in service until 1961.