FILE PHOTO: The Virginia-class USS North Dakota (SSN 784) submarine is seen during bravo sea trials in this U.S. Navy handout picture taken in the Atlantic Ocean August 18, 2013. REUTERS/U.S. Navy/Handout/File Photo
FILE PHOTO: The Virginia-class USS North Dakota (SSN 784) submarine is seen during bravo sea trials in this U.S. Navy handout picture taken in the Atlantic Ocean August 18, 2013. REUTERS/U.S. Navy/Handout/File Photo