Skip to content 
Hung Cao, the Navy’s under secretary and a retired Navy captain, has been elevated to acting Secretary of the Navy after the sudden departure of John Phelan, in one of the sharpest leadership jolts at the Pentagon this spring.
The move was announced on April 22, with Pentagon spokesperson Sean Parnell saying Phelan was leaving “effective immediately,” while Cao would step in at once.
AP and Reuters matched on the core sequence of events, even as the Pentagon offered no formal public explanation for Phelan’s exit.
A Sudden Change at the Top
The speed of the transition made the change especially striking. AP reported that Phelan had addressed the Navy’s annual Sea-Air-Space conference in Washington just a day earlier, laying out priorities for the service before his exit was announced.
That left Cao, already the department’s second-ranking civilian, to assume control of a service facing intense pressure over readiness, shipbuilding, and operations tied to a fragile ceasefire involving Iran.
Reuters went further, citing a U.S. official and another person familiar with the matter who said Phelan had been fired.
According to Reuters, frustration had grown over the pace of shipbuilding reform, tensions with senior Pentagon leadership, and an ethics investigation involving Phelan’s office.
Those details remain sourced reporting, not an official Pentagon explanation, but they help explain why the announcement landed with such force across Washington.
Who Hung Cao Is
Hung Cao is the new acting US Secretary of the Navy. Do you get the message yet, Xi? The clock is ticking. Today, Tehran. Tomorrow, Saigon. Then – Beijing. Communism (and Islamism) will fall. https://t.co/RAwCzhroIy pic.twitter.com/ObOmpavWTj
— Teortaxes▶️ (DeepSeek 推特🐋铁粉 2023 – ∞) (@teortaxesTex) April 22, 2026
Cao is not an outsider stepping into the job cold. The official Navy biography describes him as a decorated combat veteran and a qualified special operations, explosive ordnance disposal, diving, parachutist, and surface warfare officer.
It also notes his academic background in ocean engineering and applied physics, credentials that give him a markedly different profile from the financier-turned-secretary he is replacing.
Before becoming acting secretary, Cao had only recently entered the Navy’s top civilian ranks. The U.S. Senate’s daily press record shows he was confirmed as Under Secretary of the Navy on October 1, 2025, by a 52 to 45 vote.
That matters because it means the acting appointment did not come from outside the department. It came from someone who was already positioned inside the Navy’s civilian chain of command.
Why This Appointment Matters
View this post on Instagram
Cao now inherits a portfolio loaded with strategic risk. Reuters noted that the Navy sits at the center of U.S. maritime pressure on Iran, while shipbuilding has become one of the Pentagon’s most politically sensitive problems, especially as concerns over China’s naval capacity continue to shape U.S. planning.
In practical terms, Cao is stepping into the role at a moment when the Navy’s leadership cannot afford drift, delay, or prolonged internal turmoil.
For now, the essential fact is clear: Hung Cao is acting Navy secretary, and the change happened fast. What remains less clear is whether this was simply a leadership reset or part of a deeper struggle inside the Pentagon over performance, priorities, and control.
