War Secretary Pete Hegseth‘s effort to reshape the Pentagon continued this week, though this time it was with the firing of a Trump-appointed service secretary.

Sean Parnell, the top Pentagon spokesman, announced that Navy Secretary John Phelan would be leaving his position “effective immediately” on Wednesday but did not specify why. Phelan has not commented publicly on his departure, while Undersecretary Hung Cao, a former naval captain, will temporarily fill the vacancy.