A wartime naval career for King George VI

If his brother had remained king, would George VI have served actively in the Royal Navy during the Second World War?

Yes; he could plausibly have become a senior officer and taken a major Indian Ocean, Middle Eastern, or Far Eastern command.

George VI's prior naval experience and temperament support the possibility of continued active service if his brother had remained king. He could plausibly have risen to senior rank during the Second World War. A major Indian Ocean, Middle Eastern, or Far Eastern appointment would fit that alternate career. Such a path might have placed him, rather than Mountbatten, in a large combined command.