Science Advisor to the President War II by President Franklin Delano Roosevelt. Vannevar Bush chaired this office through Roosevelt's death in 1945, and continued under Roosevelt's successor Harry S. Truman until 1951. After the war, President Harry S. Truman replaced the OSRD with the Science Advisory Committee in 1951. The office was moved to the White House on November 21, 1957, by President Dwight D. Eisenhower to provide advice and recommendation in response to the Space Race started by the USSR's launch of the first artificial Earth satellite, Sputnik 1. President Richard M. Nixon eliminated the PSAC in 1973, rather than appointing a replacement for
President of Venezuela 2 terms. From 1958 to 1999, the presidential term was set at five years. A sitting president was not only barred from immediate reelection, but could not run again for 10 years (equivalent to two full terms) after leaving office. The president may be recalled after a specific time in office. Presidents of Venezuela who served under the 1864 constitution (starting with Juan Crisóstomo Falcón) bore the title of "President of the Union", instead of the usual "President of the Republic" still used today. Aside from that, all heads of state of the country since 1811 have held the title