The U.S. Navy says the USS Michigan, a guided missile submarine, has docked in South Korea on a "routine visit." It is shown here in 2014 west of Manila, Philippines. Jun Dumaguing/AP hide caption

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Jun Dumaguing/AP

An official photograph dated April 15 and posted by the Navy shows the aircraft carrier USS Carl Vinson in an Indonesian strait thousands of miles south of North Korea. MC2 Sean M. Castellano/U.S. Navy hide caption

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MC2 Sean M. Castellano/U.S. Navy

When the littoral combat ship USS Coronado set sail from Pearl Harbor for a planned deployment across the Pacific, it suffered engine problems and had to turn back. The Navy is struggling to get its new class of warships to work as planned. MC2 Ryan J. Batchelder/U.S. Navy hide caption

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MC2 Ryan J. Batchelder/U.S. Navy

Two Chinese divers from the People's Liberation Army Navy are suited up and prepared to observe U.S. Navy divers in an underwater welding exercise. Elise Hu/NPR hide caption

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Elise Hu/NPR

Rising Tensions? Yes, But The U.S. And Chinese Navies Are Training Together

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Rear Admiral Robert J. Gilbeau, left, enters a federal courthouse in San Diego where he pleaded guilty to lying to federal investigators in the "Fat Leonard" navy bribery trial. Lenny Ignelzi/AP hide caption

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Lenny Ignelzi/AP

Capt. Daniel Dusek, 49, shown in an undated photo provided by the Navy, is the highest-ranking officer to face charges so far in a Navy corruption scandal. Dusek served as the deputy director of operations for the 7th Fleet and commanded two ships, the Essex and the Bonhomme Richard. Navy hide caption

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Navy

Humpback whales and tanker in Stellwagen Bank National Marine Sanctuary in Massachusetts Bay. Green Fire Productions/Flickr hide caption

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Green Fire Productions/Flickr

Listening To Whale Migration Reveals A Sea Of Noise Pollution, Too

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Helicopter belonging to the Netherlands participates in NATO's Dynamic Mongoose anti-submarine exercise in the North Sea, off the coast of Norway, on May 4, 2015. MARIT HOMMEDAL/AFP/Getty Images hide caption

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MARIT HOMMEDAL/AFP/Getty Images