Have you ever seen a Navy ship bearing letters and numbers like DDG-51 or DD-214 and wondered what those codes mean? These ship labels might look random, but they follow a system that's been around ...

Vice Adm. Rick Cheeseman, left, chief of naval personnel, and Rear Adm. Stu Satterwhite, commander of MyNavy Career Center, observe a demonstration of MNCC's Human Resource Service Center operations ...