Swedish Ambassador to the U.S. Jonas Hafstrom, left, and Leif Brisfjord, president of the John Ericsson Society, take part in a ceremony at the John Ericsson National Monument in Washington on May 14, 2012, to mark the 150th anniversary of the Civil War’s Battle of the Ironclads. Ericsson designed the ironclad Monitor. (Nicholas Kamm / AFP/Getty Images)