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U.S. Army Secretary Dan Driscoll has submitted his resignation to President Donald Trump following months of reported tensions with Defense Secretary Pete Hegseth, the White House confirmed Monday.
Driscoll, who has served as Army secretary since February 2025, is expected to leave the Pentagon in the coming days.
The White House did not provide a specific reason for his departure, but the resignation follows reported disagreements over the Army’s modernization and readiness efforts, as well as the removal of several senior military officers.
The White House praised Driscoll’s tenure, saying he had been effective in advancing Trump’s defense agenda, strengthening military readiness and lethality, and supporting negotiations between Russia and Ukraine.
Driscoll’s departure adds to a series of leadership changes at the Pentagon under Hegseth.
His resignation could leave the Army without a Senate-confirmed civilian or military leader, with Gen. Christopher LaNeve currently serving as acting Army chief.
Driscoll, a veteran of the Iraq War and a close associate of Vice President JD Vance, was also known for promoting military modernization, drone technology and more efficient defense procurement.