170403-N-PO203-066 NATIONAL HARBOR, Md. (April 3, 2017) Dr. Chistoph Englert, branch head of Geospace Science and Technology at the Naval Research Laboratory (NRL), uses a prop to discuss his research in developing models and instruments to forecast the ionosphere while at the Office of Naval Research in (ONR) and NRL exhibit during the 2017 Sea-Air-Space Exposition. Sea-Air-Space is hosted by the Navy League of the United States with the goal of bringing together leaders from defense organizations, both government and private industry, to learn about and view the most up-to-date information and technology related to maritime policy. (U.S. Navy photo by John F. Williams/Released)