The admiral commanding America's Pacific naval fleet says he will retire.

Admiral Scott Swift made the shocking announcement in a statement released late Sept. 25.

In the statement, Swift revealed he had been informed that he would not rise to become Commander of United States Pacific Command, a usual advancement for Navy admirals who commanded the Pacific Fleet.

Admiral Scott Swift, Commander, United States Pacific Fleet. (US Navy photo)

"I have been informed by the Chief of Naval Operations that I will not be his nominee to replace Adm. [Harry] Harris as the Commander, U.S. Pacific Command," he said. "In keeping with tradition and in loyalty to the Navy, I have submitted my request to retire."

Admiral Harry B. Harris, Jr., the current commander of Pacific Command, is reportedly under consideration to serve as the United States ambassador to Australia. Prior to commanding Pacific Command, Harris had commanded the Pacific Fleet.

The Arleigh Burke-class guided-missile destroyer USS Fitzgerald (DDG 62) returns to Fleet Activities Yokosuka following a collision with a merchant vessel while operating southwest of Yokosuka, Japan. (Photo: U.S. Navy Mass Communication Specialist 1st Class Peter Burghart)

Admiral Swift's career included service with Attack Squadrons 94 and 97, flying the LTV A-7 Corsair. He saw combat during Operation Preying Mantis, and commander Air Wing 14 and Carrier Strike Group 9. His awards include the Distinguished Service Medal, Defense Superior Service Medal, Legion of Merit, Bronze Star, Meritorious Service Medal, and Air Medal with Combat V.

In recent months, the Pacific Fleet as rocked by the collisions involving the Arleigh Burke-class guided missile destroyers USS Fitzgerald (DDG 62) and USS John S. McCain (DDG 56) that killed a total of 17 sailors and seriously damaged both vessels, which were forward-based as part of Destroyer Squadron 15.

Damage to the portside is visible as the Guided-missile destroyer USS John S. McCain (DDG 56) steers towards Changi Naval Base, Republic of Singapore, following a collision with the merchant vessel Alnic MC while underway east of the Straits of Malacca and Singapore on Aug. 21. (U.S. Navy photo by Mass Communication Specialist 2nd Class Joshua Fulton/Released)

A number of other officers have been relieved of duty in the wake of those collisions, including Vice Adm. Joseph Aucoin, the commander of the 7th Fleet, and the commanders of Destroyer Squadron 15 and Task Force 70.