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A U.S. Navy warship held off on deploying to South America last week after an outbreak of COVID-19 among its vaccinated crew.

USS Milwaukee, a littoral combat ship, remained in port at Naval Station Guantanamo Bay following positive tests from some of its sailors, some of whom exhibited mild symptoms, according to a Friday announcement from the U.S. Navy.

"The crew is 100% immunized and all COVID-19 positive sailors are isolated on board and away from other crew members," the release explained. "A portion of those infected have exhibited mild symptoms."

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The USS Milwaukee, the only naval ship to date to be commissioned in her namesake city, in the state she was built, sits docked at Veterans Park in Milwaukee, Wisconsin on Nov. 20, 2015. (Photo By Raymond Boyd/Getty Images)

The USS Milwaukee, the only naval ship to date to be commissioned in her namesake city, in the state she was built, sits docked at Veterans Park in Milwaukee, Wisconsin on Nov. 20, 2015. (Photo By Raymond Boyd/Getty Images)

The press release also said, "The vaccine continues to demonstrate effectiveness against serious illness."

The Navy had set Nov. 28 as the deadline for all service members to receive vaccination against COVID-19. More than 98% of all active-duty sailors have been fully vaccinated, according to the most recent data.

The USS Milwaukee, the only naval ship to date to be commissioned in her namesake city, in the state she was built, sits docked at Veterans Park in Milwaukee, Wisconsin on Nov. 20, 2015. (Photo By Raymond Boyd/Getty Images)

The USS Milwaukee, the only naval ship to date to be commissioned in her namesake city, in the state she was built, sits docked at Veterans Park in Milwaukee, Wisconsin on Nov. 20, 2015. (Photo By Raymond Boyd/Getty Images)

The Navy did not say how many sailors had tested positive from the ship's crew, which contains a little more than 100 people, but said the ship "is following an aggressive mitigation strategy in accordance with Navy and CDC guidelines."

The USS Milwaukee began its deployment from Mayport, Fla., on Dec. 14 and was scheduled to head to the U.S. Southern Command region until the outbreak.

USS Theodore Roosevelt (Photo via iStock)

USS Theodore Roosevelt (Photo via iStock)

USS THEODORE ROOSEVELT CORONAVIRUS OUTBREAK: US NAVY FOLLOWED PROTOCOLS, WATCHDOG SAYS

The first major outbreak of COVID-19 among members of the military was in early 2020, when the aircraft carrier USS Theodore Roosevelt had to stay in Guam for about two months after more than 1,000 of its 4,800-member crew tested positive. One sailor on the ship died from the disease.

The Associated Press contributed to this report.