150414-N-AT895-592 NATIONAL HARBOR, Md. (April 14, 2015) Chief of Naval Operations (CNO) Adm. Jonathan Greenert and his wife Darleen pose for a photo with culinary specialists from Naval Supply Systems Command's "Fuel to Fight" display at the 50th Anniversary Sea-Air-Space Exposition. (U.S. Navy photo by Mass Communication Specialist 1st Class Nathan Laird/Released)