Chief of Naval Operations (CNO) Adm. Jonathan Greenert meets the crew and tours the spaces of the Virginia-class attack submarine USS New Mexico (SSN-779) during the joint exercise Fellowship 2012 with the Royal Navy submarine HMS Astute (SSN 20). New Mexico and Astute performed various tracking, deterrence and attack scenarios to test and certify each respective submarine's capabilities. (U.S. Navy photo by Mass Communication Specialist 1st Class Peter D. Lawlor/Released)