The commanding officer of the Navy base at Guantanamo Bay was relieved of duty Wednesday due to a loss of confidence in his ability to command, the Navy said. Officials reportedly said he’s under investigation in connection with an alleged affair with a woman on the base and the recent death of her husband. Capt. John R. Nettleton has been temporarily reassigned to the staff of Commander, Navy Region Southeast in Jacksonville, and replaced on an acting basis by Capt. Scott Gray, the chief of staff of that installation, the Navy said in a statement. …