150331-N-AT895-296 PENSACOLA, Fla. (March 31, 2015) Chief of Naval Operations (CNO) Adm. Jonathan Greenert tours the metal fabrication lab at the Naval Air Technical Training Center at Naval Air Station Pensacola. Naval Air Technical Training Center is the Navy's largest aviation training center. (U.S. Navy photo by Mass Communication Specialist 1st Class Nathan Laird/Released)