The Navy said a submarine commander has been relieved of his duties for unspecified allegations of personal misconduct. Commander Michael P. Ward II, commanding officer of the USS Pittsburgh, based in Groton, was relieved of his duties just one week after taking command. He was let go on Friday, and it was announced on Sunday. The Navy said it acted because of a lack of confidence in Ward’s ability to command based on allegations of personal misconduct. A spokeswoman said no details will be available. The Navy is investigating. The Navy said Ward has been reassigned to administrative duties. The Navy did not make him available and attempts to reach him Sunday were unsuccessful. The USS Pittsburgh is a fast-attack submarine with a crew of about 140.