President Donald Trump abruptly fired Air Force Gen. CQ Brown Jr. as chairman of the Joint Chiefs of Staff on Friday, sidelining a history-making fighter pilot and respected officer as part of a campaign led by his defense secretary to rid the military of leaders who support diversity and equity in the ranks.

Air Force Gen. Charles “CQ” Brown, chairman of the Joint Chiefs of Staff, was fired Friday night by President Donald Trump, and Adm. Lisa Franchetti, the chief of naval operations, was also relieved of duty.

Trump said he plans to nominate Lt. Gen. Dan “Razin” Caine of the U.S. Air Force to replace Gen. CQ Brown as the nation’s top-ranking military officer.