US Navy Secretary Steps Down in Sudden Pentagon Shake-Up

US Navy Secretary John Phelan

US Navy Secretary Steps Down in Sudden Pentagon Shake-Up

US Navy Secretary John Phelan has left his position in the United States Department of Defense, with the Pentagon confirming that his departure takes effect “effective immediately” in a sudden leadership change within the US military establishment.

Pentagon spokesman Sean Parnell announced the development in a post on social media, stating that Phelan’s exit is immediate and that Navy Undersecretary Hung Cao will serve as acting Secretary of the Navy until a permanent replacement is named. The statement from the Pentagon expressed appreciation for Phelan’s service, noting that he contributed to the administration’s defence priorities and the operational management of the US Navy.

The Pentagon has not provided a formal explanation for Phelan’s departure. However, reports from US media suggest that internal disagreements may have emerged over shipbuilding policy, naval modernization priorities, and the implementation of President **Donald Trump’s maritime expansion agenda. While these reports remain unconfirmed, sources indicate that tensions had been building within senior defence leadership over the pace and direction of Navy restructuring efforts.

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Phelan’s exit is the latest in a series of high-level changes within the US defence establishment in recent months. It comes shortly after US Defense Secretary Pete Hegseth reportedly requested the resignation of Army Chief of Staff Randy George, alongside the removal of other senior officers, including Gen. David Hodne and Maj. Gen. William Green. Since assuming office, Hegseth has overseen a broader reshuffling of military leadership, including the dismissal of more than a dozen senior officers across different branches of the US armed forces.

The position of Navy Secretary is largely administrative, with responsibilities covering policy formulation, budgeting, recruitment, training, logistics, and shipbuilding oversight within the US Navy. Phelan, a civilian businessman with no prior military service, was sworn in as Navy Secretary in March 2025 after being nominated in 2024. He was also a known political donor and supporter of President Trump’s campaign. He previously supported plans for a revamped naval expansion programme, including proposals tied to a so-called “Golden Fleet” initiative aimed at strengthening US maritime capabilities.

His successor in an acting capacity, Hung Cao, is a 25-year US Navy veteran who became Undersecretary in October 2025. Cao also ran for the US Senate in Virginia in 2024 with Trump’s endorsement and is known for his strong stance on military reforms and recruitment policies.

The leadership change comes at a time of heightened global maritime tensions, including ongoing US naval operations linked to the Strait of Hormuz, a key global oil shipping route. Washington has maintained pressure in the region amid broader security concerns involving Iran and continued instability in Middle Eastern waters. US officials say naval deployments remain part of broader efforts to protect shipping routes and maintain maritime security, even as diplomatic tensions continue.

Phelan’s departure adds to growing concerns about stability within US defence leadership, as multiple senior military officials have been replaced or reassigned in recent months. Further announcements are expected regarding permanent leadership appointments and possible structural reforms within the United States Navy.