A CIA employee helps Vietnamese evacuees onto an Air America helicopter from the top of 22 Gia Long Street, a half mile from the U.S. embassy, on April 29, 1975, shortly before Saigon fell to the advancing North Vietnamese army. #

First lady Betty Ford, on a visit with her husband to China in 1975, joins members of a dance troupe for an impromptu series of movements. Mrs. Ford herself was a serious dancer earlier in her life. #

Crowds line up outside the Rivoli Theatre to see the motion picture Jaws in New York City in August of 1975. The blockbuster film, released in June of 1975, grossed more than $100 million within two months, and soon became the highest-grossing film in the North American box office at the time. #

A one-third-scale model of NASA's Space Shuttle orbiter is placed in the test section of the Ames Research Center's 40-by-80-foot wind tunnel in 1975. The shuttle's first orbital launch would take place in April of 1981. #

Six terrorists took over the OPEC headquarters in Vienna, Austria, on December 21, 1975, and held dozens of people hostage, including several OPEC oil ministers. Here, the attackers are seen boarding a DC-9 aircraft they had demanded to fly them to Algeria. Mediators from the Interior Ministry stand at center as an armed terrorist boards the plane. Three people were killed in the initial attack, but after negotiations, all remaining hostages and terrorists walked away just days later. #

Original caption from September of 1975: "A young woman watches as her car goes through testing at an auto emission inspection station in downtown Cincinnati, Ohio. All light duty, spark ignition powered motor vehicles are tested annually for carbon monoxide and hydrocarbon emissions, and given a safety check." #

A mounted police officer pursues white demonstrators who attempted to invade an area being used by Black swimmers at Carson Beach in South Boston on August 10, 1975. Black and white swimmers threw rocks and bricks at one another at times. About 500 Black protesters were at the beach in predominantly white South Boston in response to a request by Black leaders who said they wanted to "reassert the rights of all Boston residents to use all public facilities." #

American stuntman Evel Knievel practices jumping over three vans in the parking lot of Wembley Stadium on May 23, 1975. Several days later, Knievel's attempt to jump over 13 buses in front of a crowd inside Wembley Stadium ended in a crash that left him with a broken pelvis. #

Team owner Ken Tyrrell (left) stands beside Derek Gardner, designer of the Tyrrell P34 (Project 34) Formula One race car while Patrick Depailler, of France, sits inside the radical six-wheeled race car in the pit lane at the Silverstone Circuit following the car's trial shakedown run on October 9, 1975, in Towcester, England. #

Members of the Monty Python comedy troupe, from left, John Cleese, Terry Gilliam, Michael Palin, Terry Jones, Eric Idle, and Graham Chapman, pose for a photo in Los Angeles, California, on May 16, 1975. The group's second motion picture, Monty Python and the Holy Grail had just premiered in the United States several weeks earlier. #

Original caption: "Jim Ondrus of Mount Clemens, Michigan, wears a gas mask during the opening minutes of the Detroit-St. Louis NFL game in Pontiac, Michigan, on December 21, 1975, as another spectator teases him with billowing cigarette smoke. Smoking and the banning of it in the stadium has been the subject of a recent court action in Michigan." #

Original caption, from July, 1975: "James Burke, television popularizer of science, sits inside the life-size model of a spacecraft at the BBC TV studio. The BBC and Burke planned model coverage of the Apollo-Soyuz historic linkup in space. The BBC TV Space team created specially-built life-size models of the manned sections of the Apollo and Soyuz craft." Apollo–Soyuz was a cooperative space mission between the United States and the Soviet Union, where two crewed spacecraft met in orbit, docking for two days in July of 1975. #

Thousands attend a free concert in San Francisco's Golden Gate Park featuring the Grateful Dead and Jefferson Starship, on September 28, 1975. Here, the Jefferson Starship guitarist Craig Chaquico performs at the front of the stage. #

Original caption: "Washington, D.C.: With wife Nancy by his side, Ronald Reagan announces on November 20, that he is a candidate for the Republican presidential nomination." Reagan lost the nomination to incumbent President Gerald Ford that year, but went on to win the presidency in 1980. #

The first legal wedding ceremony ever performed in a hot tub took place when Leslie Davis and Richard Bustardo got married during the Backyard Living Show in Los Angeles, California, on March 26, 1975. The ceremony was held in a five-foot hot tub, with the bride wearing a bikini and the groom attired in swimming trunks and top hat. #

The Scottish pop group the Bay City Rollers perform on an episode of Saturday Night Live with Howard Cosell, broadcast live from the Ed Sullivan Theater in New York City. #

From left: Actors Penny Marshall and Cindy Williams, seen during the filming of the opening title sequence for the television show Laverne & Shirley, in December of 1975. The show, a spin-off of the popular series Happy Days, debuted in January of 1976, becoming a popular series lasting for eight seasons. #

Original caption: "California motorcyclist Don Vesco, after completing a 293.792 m.p.h. run on the Bonneville Salt Flats. He broke his own record with a 299.490 average run the next day In doing so he set both U.S. and world speed records for two wheeled vehicles." #

Original caption: "A masked Phalange gunman plays the piano, with his assault rifle momentarily set aside, in the downstairs musical bar of the Holiday Inn on November 3, 1975, in Beirut, Lebanon. The Holiday Inn is occupied by Phalangists battling leftist Muslim fighters in Beirut's 'Hotel War.'" The conflict took place during the broader Lebanese Civil War that lasted until 1990. #

The interior of the third-floor restroom area at the State Department in Washington is shown after a bomb exploded in the early morning of January 29, 1975. The bombing was undertaken by members of the militant organization called the Weather Underground, who claimed it was in retaliation for escalations of American involvement in the Vietnam War. There were no injuries in the blast. #

Original caption: "Chuck Weiss and his wife Sandy Sarris dress as Spock and another character from the science fiction television series Star Trek. Weiss and Sarris owned the first Star Trek memorabilia store in the country. Berkeley, 1975." #

Original caption, circa 1975: "American dreams at Little Duck Key. Commercial camping sites and travel trailer courts have sprung up throughout the Keys. Even on the smaller keys like Little Duck, where no facilities have yet been constructed, camping is permitted by local authorities." #