180410-N-EX237-003 NATIONAL HARBOR, Md. (April 10, 2018) Rear Adm. John W. Tammen, director of the Undersea Warfare Division, addresses attendees during a Cross Domain Integration panel at the 2018 Sea-Air-Space Exposition. The annual event hosted by the Navy League of the United States and brings together the U.S. defense industrial base, private-sector U.S. companies, and key military decision makers for an innovative, educational, and professional maritime based event. (U.S. Navy photo by Mass Communication Specialist 2nd Class Lauren K. Jennings/Released)