170402-N-PO203-072 NATIONAL HARBOR, Md. (April 2, 2017) Kurt Yankaskas, program officer at the Officer of Naval Research (ONR), talks about the upcoming International Submarine Races during the 2017 Naval Stem Exposition, co-sponsored by the Navy League of the United States and the ONR. The event offers hands-on activities and provides middle and high school students an introduction to naval STEM careers and educational opportunities. (U.S. Navy photo by John F. Williams/Released)