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Deputy Secretary of Defense Patrick Shanahan will be acting chief of Pentagon, Donald Trump tweeted.
I am pleased to announce that our very talented Deputy Secretary of Defense, Patrick Shanahan, will assume the title of Acting Secretary of Defense starting January 1, 2019. Patrick has a long list of accomplishments while serving as Deputy, & previously Boeing. He will be great!
— Donald J. Trump (@realDonaldTrump) December 23, 2018
Secretary of Defense James Mattis decided to resign on December 21.
