30 set 1947 ano - 9/30/1947 to 10/14/1948 Vannevar Bush as chair of the DoD Research and Development Board "National Security Act of 1947 and its 1949 amendments established [DoD], including the establishment of two statutory boards: a Munitions Board, and a Research and Development Board. In June 1953, Eisenhower's Reorganization Plan No. 6 abolished the boards as such, and created six new Assistant Secretaries of Defense"

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https://en.wikipedia.org/wiki/Vannevar_Bush

https://en.wikipedia.org/wiki/Under_Secretary_of_Defense_for_Research_and_Engineering

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