John Phelan has stepped down from his role as U.S. Navy Secretary with immediate effect, the Pentagon confirmed on Wednesday.
The sudden departure adds to a growing list of high-level military leadership changes under the administration of Donald Trump, though no official reason has been given.
Pentagon spokesperson Sean Parnell announced that Hung Cao will take over the position on an acting basis. Cao, a Navy veteran, had been serving as undersecretary since late 2025.
Phelan’s exit comes at a tense moment for U.S. military operations, with ongoing conflict involving Iran and a continued naval blockade in the Strait of Hormuz—a critical global oil transit route.
While officials have not confirmed the reasons behind his resignation, reports suggest internal disagreements over shipbuilding strategies and broader military priorities may have played a role.
His departure follows a series of leadership shake-ups within the U.S. military, including the removal of several senior Army officials and other high-ranking officers in recent months.
Phelan, a businessman with no prior military service, assumed the role in March 2025 after being nominated by President Trump. During his tenure, he supported plans to expand U.S. naval power, including proposals for a new “Golden Fleet” of advanced warships.
Analysts suggest his replacement may reflect shifting priorities within the administration, particularly as geopolitical tensions continue to rise.
The leadership change also comes as clashes persist in the Strait of Hormuz, where Iran has reportedly seized vessels amid ongoing disputes with the U.S. and its allies.
