CORONAVIRUS | The US Navy has relieved the commander of the aircraft carrier Theodore Roosevelt, who wrote a scathing letter that leaked to the public asking for stronger measures to control a Covid-19 outbreak on board his warship.

The removal of Captain Brett Crozier from command of the 5,000-person vessel, which was first reported by Reuters, was announced by acting US Navy secretary Thomas Modly, who said the commander exercised poor judgment.

The dismissal, two days after the commander's letter leaked, was a dramatic example of how Covid-19 is challenging US institutions, even those accustomed to dangerous and complex missions like the US military.

The move could have a chilling effect on others in the Navy looking to speak up about issues they are facing at a time when the Pentagon is withholding some of the more detailed data about Covid-19 infections for fear of undermining the perception of US military readiness for a crisis or conflict.

Reuters first reported last week that the Pentagon would start withholding some data about infections in its ranks.

Modly said the letter was sent through the chain of command but Crozier did not safeguard it from being released outside the chain.

"I have no information nor am I trying to suggest that he leaked the information," Modly told a news conference.

"He sent it out pretty broadly and in sending it out pretty broadly, he did not take care to ensure that it couldn't be leaked and that's part of his responsibility.

"It raised alarm bells unnecessarily," he added.

The Navy's move was criticised by Democratic senator Mark Warner, who said the Navy needed people willing to speak up for sailors. He said that Crozier, by his actions, appeared to be a patriot "just trying to do what’s best for his crew."

"I don’t know why you would punish someone for that, especially with so many lives at stake," he said.

President Donald Trump, when asked about the captain during a news conference at the White House, said he did not agree with the suggestion that it appeared Crozier was being removed for trying to save the lives of sailors.

"I don't agree with that at all. Not at all. Not even a little bit," Trump said.

Over 100 personnel on the Theodore Roosevelt have tested positive for the virus so far.

In the four-page letter, Crozier, who took command in November, described a bleak situation aboard the nuclear-powered carrier as more sailors tested positive for the highly contagious respiratory virus.

He called for "decisive action": removing over 4,000 sailors from the ship and isolating them. He said that unless the Navy acted immediately, it would be failing to properly safeguard "our most trusted asset - our sailors."

The letter put the Pentagon on the defensive about whether it was doing enough to keep the warship's crew members safe, and alarmed the families of those aboard the vessel, whose home port is in San Diego.

The carrier was in the Pacific when the Navy reported its first Covid-19 case a week ago. It has since docked at US naval base Guam on the southern end of the American island territory in the western Pacific.

The Theodore Roosevelt is just the latest example of the spread of the respiratory virus within the US military. Navy officials say that sailors on board a number of ships have tested positive, including an amphibious assault ship at port in San Diego.

Modly said he thought the decision to relieve Crozier would not have a chilling effect.

"I hope that what this will do, it will reinforce the fact that we have the proper way of handling this," Modly said.

The Navy is still bruised from avoidable warship crashes in the Pacific that killed 17 sailors in 2017, raising concerns about gaps in basic Navy training and the pace of operations. They prompted a congressional hearing and the removal of a number of officers.

US Senator Jack Reed, the top Democrat on the Senate Armed Services Committee, said the incident with the Theodore Roosevelt "raises critical questions about the Navy’s strategy to combat Covid-19 within the ranks and on board ships and submarines."

"Should the Navy be doing more? What adjustments are they making? The Covid-19 pandemic is urgent and evolving and it is incumbent upon the civilian and uniformed leadership to provide clear guidance not just to the committee, but to our forces and the American taxpayers," Reed said.

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