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In page Martin B-57 Canberra:

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Later in August 1965, a single RB-57F would be deployed to Udorn, RTAB in an attempt to gather information about North Vietnamese SAM sites, first under project Greek God and then under project Mad King. In December another RB-57F would be deployed for this purpose, under project Sky Wave. Neither project garnered useful results and they were terminated in October 1965 and February 1966 respectively.[3]