Story highlights Capt. John R. Nettleton has been reassigned to Florida

An inappropriate relationship is alleged, according to a U.S. military official

(CNN) The commanding officer of the U.S. Naval Station in Guantanamo Bay, Cuba, has been relieved of duty "due to loss of confidence" in his "ability to command," the Navy says.

At issue is an allegation of an inappropriate relationship, a U.S. military official told CNN.

Capt. John R. Nettleton has been temporarily reassigned to a post in Jacksonville, Florida, the Navy said in a statement released Wednesday.

The Navy did not say why, withholding further details "due to an ongoing NCIS (Naval Criminal Investigative Service) investigation."

But a U.S. military official said that in the course of investigating the death of a civilian, the Navy received information alleging that Nettleton was engaged in an inappropriate relationship with the civilian's wife.

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