support ships had to receive radiological clearance; if necessary, they underwent decontamination.

DNA designates the period 1 July through 31 August 1946 as Operation CROSSROADS, adding the 6-month period 1 September 1946 through 28 February 1947 as the ''post-CROSSROADS" period. The period after that, however, despite ongoing work in Navy yards and in the atoll on contaminated ships, is officially considered neither the CROSSROADS nor post-CROSSROADS period.

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