The USS Fitzgerald collided with a Philippine-flagged container ship off the coast of Japan on June 17, 2017. The $1.8 billion destroyer, manned by a 300-member crew, had been steaming on a secret mission to the South China Sea when it was struck by a cargo ship more than three times its size. Seven sailors died. Eugene Hoshiko/AP hide caption
The damaged section of the USS Fitzgerald is seen at the U.S. naval base in Yokosuka, southwest of Tokyo. Eugene Hoshiko/AP hide caption
Two U.S. F/A-18s and the Japan Air Self-Defense Force's F-15 fly over the USS Ronald Reagan ahead of a joint exercise at an undisclosed location earlier this month. AP hide caption
The USS John S. McCain sails toward a naval base in Singapore in August, the massive dent in its side visible on the right side of the frame. The destroyer had collided with a tanker just hours before — the second such deadly collision involving a U.S. Navy warship in several months. Roslan Rahman/AFP/Getty Images hide caption
The USS John S. McCain, shown docked in Singapore on Aug. 22, was damaged after colliding with an oil tanker. Two top U.S. Navy officers were dismissed Tuesday as the 7th Fleet continues its investigation into the crash. Wong Maye-E/AP hide caption
Damage to the USS John S. McCain is visible as the guided-missile destroyer steers toward Changi naval base in Singapore following a collision with the merchant vessel Alnic MC in August. Mass Communication Specialist 2nd Class Joshua Fulton/AP hide caption
The guided-missile destroyer USS John S. McCain moored pier side at Changi naval base in Singapore. Grady T. Fontana/AP hide caption
U.S. Navy Vice Adm. Joseph Aucoin, commander of the U.S. 7th Fleet, speaks during a news conference in June after the USS Fitzgerald collided with a container ship off Japan. Eugene Hoshiko/AP hide caption
Damage to the port side is visible as the guided-missile destroyer USS John S. McCain steers toward Changi naval base in Singapore following a collision with the merchant vessel Alnic MC on Monday. Mass Communication Specialist 2nd Class Joshua Fulton/AP hide caption
Damage to the port side is visible as the guided-missile destroyer USS John S. McCain steers toward Changi naval base in Singapore following a collision with the Alnic MC tanker on Monday. Mass Communication Specialist 2nd Class Joshua Fulton/AP hide caption