I don't know exactly where the Stennis was at the time, I assume North Arabian Sea. At any rate he was relieved by Commander 5th fleet and the Strike Group had already chopped from 7th fleet to 5th fleet (per open news sources in-chopped on 17 Oct). Either way difficult to see the exact relation to Benghazi, other than the timing. I think the USN fires 10-20 ship COs a year. It's a weeding out process.