U.S. Army Secretary Dan Driscoll has resigned from his position after serving for 18 months, as announced by the White House on Monday. This departure is part of a series of changes in top military leadership under the current administration of U.S. President Donald Trump.

While no specific reason was provided for Driscoll’s resignation, reports suggest that tensions with Secretary of War Pete Hegseth may have played a role. White House spokesperson Anna Kelly praised Driscoll for his contributions to advancing President Trump’s goals, including enhancing military readiness, facilitating negotiations between Russia and Ukraine, and other achievements that strengthened the U.S. Army’s capabilities.

The recent shakeups in military leadership have seen Navy Secretary John Phelan, Gen. Randy George, and Gen. Christopher Donahue leaving their respective positions. Gen. Christopher LaNeve has taken over as the acting chief of staff following George’s departure. Under LaNeve’s leadership, the army has decided to discontinue a drone modernization program that Driscoll had supported, opting to return to traditional infantry operations.

Driscoll, an Iraq war veteran and tech investor, was known for his role as a negotiator in the conflict between Russia and Ukraine. His confirmation as army secretary in February 2025 was met with a bipartisan Senate vote, emphasizing the need for modernization and recruitment improvements within the army.

Having a family history of military service, Driscoll expressed his commitment to addressing the soldiers’ needs during his tenure. Despite the challenges, Driscoll’s legacy includes his efforts to streamline military contracting processes for drone development and counter-drone capabilities in response to evolving global warfare scenarios.