Five former defense chiefs are calling on Congress to hold immediate hearings on Trump's firings of the Joint Chiefs chairman and other senior leaders.
Defense Secretary Austin will bid farewell Friday following a term that included three major military crises, a global pandemic and a brush with cancer.
It's the latest development in the U.S. military's struggle to bring to justice the man charged with planning the Sept. 11 attacks on the United States.
U.S forces are still needed in Syria to prevent ISIS from reconstituting as a major threat following Assad's ouster, Defense Secretary Lloyd Austin said.