June 15, 1916 – U.S. President Woodrow Wilson signs a bill incorporating the Boy Scouts of America, making them the only American youth organization with a federal charter.
June 30, 1937 – First National Jamboree, held at Washington, DC. Ran from June 30-July 9. Was to have been in 1935, but was canceled due to a polio epidemic.
June 30, 1950 – Second National Jamboree, held at Valley Forge, Pennsylvania, begins. Ran from June 30-July 6.