NEW YORK (Reuters) - The U.S. Navy is investigating a complaint that seeks the evacuation of civilian and military lawyers from parts of the U.S. base in Guantanamo Bay, Cuba, following reports of cancer cases among personnel working on the trials of detainees there. At least seven civilians and military members who worked on detainee trials at Guantanamo Bay have been diagnosed with cancer, according to the complaint, which was filed with the U.S.