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Sean Gerard Joseph Stackley (born August 7, 1957) is an American engineer and former naval officer who served as the Assistant Secretary of the Navy for Research, Development and Acquisition from July 2008 to August 3, 2017. He also served as the acting Secretary of the Navy from January 20 to August 3, 2017. As of September 2018, he is SVP and President, Communications & Networked Systems Segment at L-3 Technologies. Wikipedia