The 澳门新葡2229网站S Theodore Roosevelt (CVN-71) is seen while entering into the port in Da Nang, Vietnam, March 5, 2020. REUTERS/Kham
The 澳门新葡2229网站S Theodore Roosevelt is seen while entering into the port in Da Nang, Vietnam, March 5, 2020.

WASHINGTON - The U.S. Navy has relieved the captain of the 澳门新葡2229网站S Theodore Roosevelt aircraft carrier who sounded the alarm about a coronavirus outbreak onboard.?

Acting Navy Secretary Thomas?Modly?told reporters at the Pentagon on Thursday that Captain Brett Crozier?would be replaced with Rear Admiral-select?Carlos?Sardiello, the ship’s former captain.

Acting Secretary of the Navy Thomas Modly, testifies to the Senate Armed Services Committee during a hearing examining military…
Acting Secretary of the Navy Thomas Modly, testifies to the Senate Armed Services Committee in Washington, Dec. 3, 2019.

“A more agile and a more resilient mentality is necessary up and down the chain of command,”?Modly?said. “We require commanders with judgment, maturity and leadership composure under pressure to understand the ramifications of their actions within that larger dynamic strategic context.”?

Modly?said he had "lost confidence" in the captain, who will remain in the Navy, according to officials.?

Kelly Magsamen, vice president of national security and international policy at the Center for American Progress and a former senior Pentagon official, said the decision to relieve Crosier was "outrageous" and suggested the captain should be promoted.?

"It is yet another unjustified punishment of a whistleblower who went through the proper chain of command to raise concerns," Magsamen said. "Just one day ago, Navy leadership was praising this captain for raising those concerns. Today, he has been relieved without good cause amid spurious allegations of causing unnecessary panic."?

Captain Brett Crozier addresses the crew for the first time as commanding officer of the aircraft carrier 澳门新葡2229网站S Theodore Roosevelt in San Diego, California, March 1, 2020.
Capt. Brett Crozier wrote a letter of concern to his superiors. The letter was later leaked to the press.

Earlier this week the Roosevelt’s captain wrote a letter of concern to his superiors urging them to take?"decisive action" to prevent deaths from the coronavirus.?The letter was later leaked to the press.?

“We are not at war and therefore cannot allow a single?sailor to perish as a result of this pandemic unnecessarily,"?Crozier?wrote in the letter, first obtained by the?San Francisco Chronicle.??

The?Navy?has been?working to?evacuate?the bulk of?the nearly 5,000?sailors aboard the Roosevelt?in an effort?to clean the ship after a large COVID-19?outbreak.????

Modly?said?more than 110?of?the?carrier’s sailors?had tested positive for?the?coronavirus.?

About 1,000 personnel have been evacuated?in Guam, with plans to have about 2,700?removed from the?aircraft carrier?in the next couple of days. But?Modly?stressed?on Wednesday that?the Navy “cannot and will not remove all sailors from the ship.”??

Chief of Naval Operations Admiral Mike?Gilday?said about 1,000 sailors would need to remain on the ship to maintain its?“critical functions” and weapons.?The carrier has a nuclear power plant on board, along with munitions and expensive aircraft.??

WATCH: Crew gives Capt. Crozier a standing ovation as he leaves ship