Daniel Driscoll resigned as Army secretary Monday.
The Army now has no confirmed civilian secretary or top officer amid two wars.
Driscoll clashed with Hegseth over the defense secretary’s removal of senior commanders, undermining the civilian-control role his office exists to protect.
Trump has not named a replacement, with midterm elections narrowing the Senate confirmation window.
Sources: The New York Times, Hindustan Times, Al Jazeera Online, The New Arab