EVB2941478: North Vietnamese refugees arrive at Da Nang, South Vietnam. Standing in a fishing boat, they applaud as they reach safe harbor in Tourane (Da Nang), South Vietnam. 1957 / Bridgeman Images

EVB2941486: Refugees flee Tet Offensive in Hue. Refugees use a rope ferry to escape to the south shore of the Perfume River despite the destroyed bridge. c. February 1968 / Bridgeman Images

EVB2941489: An young Vietnamese widow mourns. Hugging a photo of her missing husband, she attends a mass funeral service for 400 killed in Hue during the Tet Offensive. Oct. 14, 1968 / Bridgeman Images

EVB2941498: USO entertains troops in Thailand. Comedienne Phyllis Diller rides in a tricycle rickshaw as the Bob Hope USO Christmas show arrives at Korat Air Base, Thailand. Dec. 1966 / Bridgeman Images

EVB2941504: Chi Thanh Nguyen (1914-1967), was a general during the First Indochina War against the French. In 1965 was the leading strategist and military commander of the People's Army of Vietnam until he died of a heart attack in July 1967 / Bridgeman Images

EVB2941506: South Vietnam Viet Cong with captured US 81mm mortar. 1965 / Bridgeman Images

EVB2941507: Justice Abe Fortas (1910-1982), in a White House meeting on Nov. 2, 1967. When President Johnson appointed Fortas to the Supreme Court in 1965, he continued to advise Johnson on political and legal affairs / Bridgeman Images

EVB2941509: South Vietnamese Generals who led the 1963 Coup against President Ngo Dinh Diem. From left: Generals Duong Van Minh, Le Van Kim, and unidentified officer, and General Tran Van Don / Bridgeman Images

EVB2941514: Diem after a Nov. 11, 1960 coup attempt. South Vietnamese President Ngo Dinh Diem, receives a pledge of loyalty from the Vietnamese Air Force, following his survival of an attempt to over through his regime by Air Force colonels / Bridgeman Images

EVB2942317: American soldiers reads in the shade under a US Marine tank in Beirut, Lebanon. The US intervention in Lebanon's was the first application of the Eisenhower Doctrine, which protected regimes threatened by international communism. July 1958 / Bridgeman Images

EVB2942327: Hillary Clinton, US Secretary of State, speaking at George Washington University, on August 16, 2011 / Bridgeman Images

EVB2942335: Scientists with a model of the molecular structure of cortisone. Senator Joseph O'Mahoney (center), with National Institute of Health scientists' Dr. Floyd S. Daft, and Dr. Joseph J. Bunim. 1956 July 17, 1956 / Bridgeman Images

EVB2942340: Yolande Betbeze, Alabama's entry won the 1951 Miss America beauty contest. After winning the title she refused to wear a bathing suit at public events. She later marched for civil rights, took part in Woolworth sit-ins, and marched in a feminist demonstration against Miss America pageant / Bridgeman Images

EVB2942352: Technicians in a nuclear reactor control room at NASA's Plum Brook Station in Sandusky, Ohio. 1959 / Bridgeman Images

EVB2942371: Family basement fallout shelter. It was supplied with a 14-day food and water supply, a battery-operated radio, auxiliary light sources, first aid, sanitary and other equipment. Early 1950s / Bridgeman Images

EVB2942376: The B53 was a high-yield bunker buster thermonuclear weapon developed by the United States during the 1960s Cold War. Over 300 were produced, each with a with 9 megatons yield. The stockpile's dismantlement was completed in 2011 / Bridgeman Images

EVB2942385: A nuclear engineer is protected from radiation by a fifty-two inch thick oil-filled, glass window as he operates a robotic arm. NASA's Plum Brook Station in Sandusky, Ohio, 1961 / Bridgeman Images

EVB2942395: NASA's new spacecraft is an enlarged updated capsule will fly astronauts into space following the retirement of the Space Shuttles in 2012 / Bridgeman Images

EVB2942405: Mosaic image of Mars taken by NASA's Mars Exploration Rover 'Opportunity'. January 2012 / Bridgeman Images

EVB2940065: US soldier and Blek a working dog clear caves and search for weapons in the Zirat Mountain Area Afghanistan. July 7 2010 / Bridgeman Images

EVB2940076: US Army working dog team conducts a patrol in the Zhari district of Kandahar province Afghanistan April 21 2011 / Bridgeman Images

EVB2940079: President and Mrs. Reagan dance at the Inaugural Ball at the D.C. Convention Center. Mrs. Reagan's gown designed by James Galanos. Jan. 21 1985 / Bridgeman Images

EVB2940087: President Ronald Reagan kisses Mrs. Reagan after taking his second oath of office in the Capitol rotunda. Jan. 21 1985 / Bridgeman Images

EVB2940089: President and Mrs. Reagan greet their friends and guests during their gala celebration at the Capital Center. At right is Frank Sinatra who produced the show. Jan. 19 1985 / Bridgeman Images

EVB2940092: Riko a US Army working dog barks during a training demonstration in Mosul Iraq. Aug. 17 2009 / Bridgeman Images

EVB2940094: President-elect George W. Bush is sworn in as the 43th President by Supreme Court Chief Justice William Rehnquist on Jan. 20 2001 / Bridgeman Images

EVB2940100: Robert Gates is sworn in as the 22nd Secretary of Defense by VP Cheney as President Bush and Gates' wife Becky look on during a Dec. 18 2006 Pentagon ceremony. Gates would serve until mid-2011 / Bridgeman Images

EVB2940102: President Bush and soldiers fill there plates in the buffet line in the club on Charleston Air Force Base S.C. July 24 2007 / Bridgeman Images

EVB2940105: Robert Gates 22nd secretary of defense speaks after taking his oath of office as President Bush and VP Cheney look on during a Dec. 18 2006 Pentagon ceremony / Bridgeman Images

EVB2940001: President George W. Bush center poses with sailors on the Aircraft Carrier USS ABRAHAM LINCOLN on May 1 2003. During this visit he spoke from the flight deck with a 'mission accomplished' sign as a backdrop stating 'major combat operations in Iraq have ended. In the battle of Iraq the United States and our allies have prevailed.' / Bridgeman Images

EVB2940016: President Reagan attaches a medal to a flag-draped coffin of one of four Marines killed in the Zona Rosa terrorist attack in San Salvador El Salvador. June 22 1985 / Bridgeman Images

EVB2945065: World War 2 dead from European War Cemeteries arriving at Brooklyn Army Base, New York, in 1947. U.S. government transferred dead soldiers bodies at their families request / Bridgeman Images

EVB2945072: American guards a rare Japanese POW on Namur, Marshall islands. Feb. 2, 1944 during World War 2 / Bridgeman Images

EVB2945073: Japanese POW, Commander Jiro Saito, was a member of the staff of Adm. Takeshita Tsujimura. When captured he asked for a knife to commit suicide, but was refused by his captor, U.S. Sgt. Louis Doddo. Battle of Saipan, June 15-July 19, 1944, during World War 2 / Bridgeman Images

EVB2945081: Discharged Japanese soldiers going home after the end of World War 2. Sept. 1945 / Bridgeman Images

EVB2945082: 'I cease resistance,' American Propaganda leaflet targeted to Japanese troops to induce their surrender. It promises humane treatment and includes a photo of three POWs with cigarettes. Text includes explanation of treatment of prisoners of war according to the Geneva Convention. 1945, during the last year of World War 2 / Bridgeman Images