An H-21 Shawnee leaves the Pentagon on Nov. 21, 1955 with officials heading to Camp David in Maryland for a meeting with President Dwight D. Eisenhower. (Bettmann/Getty Images)
An H-21 Shawnee leaves the Pentagon on Nov. 21, 1955 with officials heading to Camp David in Maryland for a meeting with President Dwight D. Eisenhower. (Bettmann/Getty Images)