Navy Secretary John Phelan has resigned effective immediately, as confirmed by Pentagon spokesman Sean Parnell. The reason for his departure remains unclear, whether it was a resignation or termination. Phelan's exit comes during a critical period for the US Navy, which is currently managing a blockade of the Strait of Hormuz, a vital maritime route. His resignation follows other high-profile departures from the Pentagon since the onset of the Iran war, including the recent dismissal of Army Chief of Staff General Randy George by Defense Secretary Pete Hegseth. Phelan, who was nominated by President Donald Trump, played a key role in a modernization initiative for US shipbuilders, seeking substantial funding to expand the Navy. Undersecretary Hung Cao, who has a diverse background including a military career and experience in the private sector, will serve as the acting secretary of the Navy.