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Operation Highjump (OpHjp), officially titled The United States Navy Antarctic Developments Program, 1946-47, was a United States Navy operation organized by Rear Admiral Richard E. Byrd in Antarctica under the command of Richard Cruzen, which was launched on 26 August 1946 and lasted until 1947. The massive Antarctic task force included 4,700 men, 13 ships, and multiple aircraft.

The stated claims of the operation were as follows

to train personnel and test material in the frigid zones
to consolidate and extend American sovereignty over the largest practical area of the Antarctic continent
to determine the feasibility of establishing and maintaining bases in the Antarctic and to investigate possible base sites
to develop techniques for establishing and maintaining air bases on the ice, with particular attention to the later applicability of such techniques to operations in interior Greenland. (where, it was then believed, physical and climatic conditions resembled those in Antarctica)
to amplify existing knowledge of hydrographic, geographic, geological, meteorological and electromagnetic conditions in the area.

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