EVB2941768: Vietnam War. US Marine Lieutenant instructs soldiers in an extreme leg and stomach muscle exercise performed over a sandbagged foxhole. Aug. 13, 1966 / Bridgeman Images

EVB2941777: Vietnam War. South Vietnamese militiamen from the country's 44 provinces, received 13 weeks of training. c. 1970 / Bridgeman Images

EVB2941867: Monticello, the home built by Thomas Jefferson in the 1770s. South Staircase. 1978 / Bridgeman Images

EVB2941981: NASA Mission Control during Apollo 11 moon mission. Monitors show President Richard Nixon greeting the astronauts aboard the USS Hornet. July 24, 1969 / Bridgeman Images

EVB2941999: Norman Vincent Peale was an American cleric and author of the class self-help book, 'The Power of Positive Thinking'. In 1960, Peale opposed the election of Catholic John Kennedy because 'our culture is at stake.' / Bridgeman Images

EVB2942038: Joe Namath playing golf at the University of Alabama in Tuscaloosa. 1966 / Bridgeman Images

EVB2942060: President John Kennedy in the White House Rose Garden. Oct. 24, 1961 / Bridgeman Images

EVB2942069: President John F. Kennedy announcing the US establishment of a naval blockade against Cuba, during the Missile Crisis. Oct. 22, 1962 / Bridgeman Images

EVB2942084: Silhouette portrait of Jacqueline Kennedy carrying her son John Kennedy Jr. in the White House, South Portico Entrance, 1962 (b/w photo) / Bridgeman Images

EVB2942096: President Kennedy throws out first ball on Opening Day of 1961 Baseball Season, 1961 / Bridgeman Images

EVB2942099: President John Kennedy, smoking a small cigar at a Democratic fundraiser in Boston's Commonwealth Armory. Oct. 19, 1963 / Bridgeman Images

EVB2942117: Astronaut crew training for the first Apollo mission. On Jan. 27, 1967 / Bridgeman Images

EVB2942132: Apollo 11 Earth rise over the Moon. Earth on the horizon in the Mare Smythii Region of the Moon. Image 3 of a NASA sequence of 18. July 20, 1969 / Bridgeman Images

EVB2942091: President's Birthday Party, given by White House Staff, 1963 / Bridgeman Images

EVB2942183: US Astronauts and Russian Cosmonauts pose in front of a monumental statue of Yuri Gagarin. The International Space Station Expedition 14 crew are in Baikonur, Kazakhstan to prepare from their Sept. 18, 2006 launch / Bridgeman Images

EVB2942237: Apollo 12 Astronaut Alan Bean deploys scientific experiments on the lunar surface. The bright flare of light is caused by the Sun. The Lunar Lander is in the distance. Nov. 19, 1969 / Bridgeman Images

EVB2942229: First test flight of a giant Saturn V rocket for the Apollo 4 mission at the Kennedy Space Center. Nov. 8, 1967 / Bridgeman Images

EVB2942259: Space shuttle Endeavour launch was the 57th Space Shuttle mission. June 21,1993 / Bridgeman Images

EVB2942258: Space shuttle Discovery launch on Sept. 29, 1988. The launch was the first since the Challenger disaster on Jan. 28, 1986 / Bridgeman Images

EVB2942271: Space shuttle Atlantis atop the a customized 747 flies piggy back to the Kennedy Space Center after a ten month refurbishment. Sept. 1, 1998 / Bridgeman Images

EVB2942291: Space Shuttle Columbia on a pillar of exhaust as it begins its ten-day mission on Oct.22, 1992 / Bridgeman Images

EVB2942286: Space shuttle Challenger disaster. 76 seconds into flight, reddish-brown cloud envelops the disintegrating shuttle. Fragments of the shuttle can be seen tumbling against a background of fire. Jan. 28, 1986 / Bridgeman Images

EVB2942342: Miss New York City beauty contestants line up atop a city hotel in 1952 / Bridgeman Images

EVB2942331: Hillary Clinton with Kareem Abdul-Jabbar. They met to discuss his new role as a global Cultural Ambassador. Jan. 18, 2012 / Bridgeman Images

EVB2942098: President Kennedy throws out first ball of the 32nd All-Star Baseball Game, 1962 / Bridgeman Images

EVB2942393: The Cray Y 190A Supercomputer at the NASA Ames Research Center. March 1, 1990 / Bridgeman Images

EVB2942453: George Kennan in New York on Nov. 19, 1951 (photo) / Bridgeman Images

EVB2942465: McCarthy with a letter from former war secretary Harry Woodring. Aug. 2, 1954 / Bridgeman Images

EVB2942653: Wounded American officers playing bridge with Mrs. William Ellis Corey, then the wife of the American steel magnate. The former actress, Mabelle Gilman, established a canteen for officers at her Chateau de Villegnis in the Valley of Chavreate during World War I. Sept. 18, 1918, Unknown photographer, (20th century) / Bridgeman Images

EVB2942577: The congestion of traffic on roads behind the American lines in the Argonne. Battle of the Argonne Forest, was a part of the final Allied offensive of World War I. It was fought from Sept. 11, 1918, until the Armistice of Nov. 11, 1918, Unknown photographer, (20th century) / Bridgeman Images

EVB2942586: Lt. Earl Carroll, prominent composer, was a full-fledged World War I aviator. He sits beside his fast scout machine. c. 1918 / Bridgeman Images

EVB2942613: World War I French troopers under General Gouraud, driving back the Germans with their machine guns, from the shelter of cathedral ruins. 1918, Unknown photographer, (20th century) / Bridgeman Images

EVB2942628: World War I German soldiers in their protected trenches on the Belgian frontier. The troops are aiming at the enemy. 1914-1918, Unknown photographer, (20th century) / Bridgeman Images

EVB2940974: President Lyndon Johnson and Martin Luther King Jr. in the Cabinet Room White House. March 18 1966, Okamoto, Yoichi (1915-85) / Bridgeman Images

EVB2941004: Nixon in China. President Richard Nixon and Chinese Premier Zhou Enlai toast at a Banquet. February 25 1972 / Bridgeman Images

EVB2941028: Vice President Richard Nixon with his family on vacation in Australia. 1953 / Bridgeman Images