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Patrick “Pat” Michael Shanahan (born June 27, 1962) is the president and chief executive officer of Spirit AeroSystems. He is a former United States federal government official who served as the acting United States Secretary of Defense in 2019. President Donald Trump appointed Shanahan to the role after the resignation of Jim Mattis. Prior to that, Shanahan served as Deputy Secretary of Defense from 2017 to 2019. Before his government service, he previously spent 30 years at Boeing in a variety of roles.The White House announced on May 9, 2019, that Trump intended to nominate Shanahan as the Secretary of Defense. That decision was reversed on June 18, 2019, when Shanahan said that he was withdrawing, and Trump announced that he would be making Mark Esper the acting U.S. Secretary of Defense. Shanahan's last day in that position was June 24, 2019.