Sailors from Mobile Diving and Salvage Unit 2 (MDSU 2) describe the nomenclatures of the KM 37 helmet while presenting a technical demonstration to Vice Adm. William Moran, chief of naval personnel. MDSU 2 is an expeditionary mobile unit home-ported at Joint Expeditionary Base, Little Creek-Fort Story. (U.S. Navy photo by Mass Communication Specialist 2nd Class Jared Aldape/Released)