Navy Secretary Richard Spencer took the reins at the Pentagon on Monday, becoming the third acting defense secretary since January.
Spencer is expected to temporarily lead the Pentagon while the Senate considers Army Secretary Mark Esper's nomination to succeed James Mattis as defense secretary. The Senate officially received Esper's nomination on Monday.
The Pentagon's Office of the Inspector General on Thursday cleared former Boeing executive and current acting Defense Secretary Patrick Shanahan of allegations that he unethically favored Boeing in an official capacity as head of the Defense Department — and the only thing he's guilty of is criticizing the F-35 program for being an expensive disaster.
Defense Secretary James Mattis reportedly views himself as President Donald Trump's "babysitter," and his efforts to restrain the bombastic leader apparently created tensions with former White House national security adviser H.R. McMaster.