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Investigators onboard the USNS Apache retrieved the tow pinger that was used to look for El Faro's voyage data recorder on Oct. 24. Although the wreckage of the ship has been found, the recorder is still missing. John Paul Kotara II/AP hide caption

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John Paul Kotara II/AP

Crew members of the U.S. Navy destroyer USS Jason Dunham load supplies while docked in Guantanamo Bay, Cuba, earlier this year. The U.S. and Cuba have restored diplomatic relations, but the U.S. says it remains committed to keeping the base. David Welna/NPR hide caption

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David Welna/NPR

Despite Better U.S.-Cuba Relations, Guantanamo Set To Stay In U.S. Hands

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Yusra Siddiqui, right, and Zoha Ahmad, who came with others from the Islamic Society of Greater Chattanooga to offer their support, pray during an interfaith vigil at Olivet Baptist Church held in remembrance of victims of Thursdays shootings. Doug Strickland/TNS/Landov hide caption

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Doug Strickland/TNS/Landov

Sun Jianguo (left), from the Chinese People's Liberation Army Navy, chats with U.S. Secretary of Defense Ashton Carter in May during the ministerial luncheon at the 14th Asia Security Summit in Singapore. Each country has grown increasingly wary of the other's actions and interests in the South China Sea. Roslan Rahman/AFP/Getty Images hide caption

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Roslan Rahman/AFP/Getty Images

China's Island-Building Has Neighbors On Edge, But Tensions May Be Easing

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To put their probes into the Arctic Ice, researchers hitched a ride on a South Korean icebreaker. Courtesy of Craig M. Lee/University of Washington hide caption

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Courtesy of Craig M. Lee/University of Washington

Navy Funds A Small Robot Army To Study The Arctic

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A laser weapon system on the USS Ponce, which has been deployed to the Persian Gulf. The Navy released a video showing the system taking target practice. John F. Williams/U.S. Navy hide caption

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John F. Williams/U.S. Navy

A Minuteman III missile engine is loaded into a truck for transport to another building for X-raying before being torn down and rebuilt. The Air Force's missile command-and-control structure has been the subject of several recent scandals. Douglas C. Pizac/AP hide caption

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Douglas C. Pizac/AP

An Oct. 28, 1985 photo of John A. Walker Jr., being escorted by a federal marshal as he leaves the Montgomery County Detention Center in Rockville, Md., enroute to a federal court in Baltimore. He was ultimately sentenced to life in prison on espionage charges. Bob Daugherty/AP hide caption

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Bob Daugherty/AP

This handout photo provided by the Office of the Defense Secretary (OSD), taken Aug. 19, 2014, shows a Chinese fighter jet that the White House said Friday conducted a "dangerous intercept" of a U.S. Navy surveillance and reconnaissance aircraft. Uncredited/AP hide caption

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Uncredited/AP

This handout photo provided by the Office of the Defense Secretary (OSD), taken Aug. 19, 2014, shows a Chinese fighter jet that the White House said Friday conducted a "dangerous intercept" of a U.S. Navy surveillance and reconnaissance aircraft. Uncredited/AP hide caption

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Uncredited/AP