Leon Panetta is the 23rd Secretary of Defense today. The first was James Vincent Forrestal. He served from September of 1947 until March of 1949 at the pleasure of President Dwight Eisenhower. Panetta begins his tour at the Pentagon after finishing a two year stint as director of the CIA. Many experts expect that his ground work to improve relations between the intelligence community with the Congress may produce dividends for the Pentagon as well.