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Wikipedia dixit:

“The flight [Friendship 7] occurred on February 20, 1962 from Cape Canaveral, later renamed Kennedy Space Center. There were eleven delays during the countdown due to equipment malfunctions, improvements to equipment that was functioning properly, and weather. During Glenn’s first orbit, there was a scheduled 30 minute test to see if Glenn could fly the spacecraft manually. This test became significant once a failure of the automatic control system was detected at the end of the first orbit. This forced Glenn to operate in manual mode for the second and third orbits, as well as re-entry.

Later in the flight, telemetry indicated that the heat shield had become loose. If the telemetry was correct, Glenn’s spacecraft would likely have been destroyed during re-entry due to the intense heat. Flight controllers had Glenn modify his re-entry procedure by keeping his retrorocket pack on over the shield to help retain it during re-entry. Leaving the retrorocket pack on caused large chunks of flaming debris to fly past the window of the capsule during re-entry, although Glenn thought it could have also been the heat shield. He told an interviewer, “Fortunately it was the rocket pack – or I wouldn’t be answering these questions.” After the flight, it was determined that the indicator was faulty.

Friendship 7 made splashdown 800 miles southeast of Cape Canaveral safely after his 4-hour, 55 minute flight. Glenn carried a note with him on the flight that read, “I am a stranger. I come in peace. Take me to your leader and there will be a massive reward for you in eternity,” translated into several different languages, in case he landed near islands in the South Pacific Seas. The original procedure called for Glenn to exit through the top hatch, but he was uncomfortably warm and decided that an egress through the side hatch would be faster. During the flight, he endured 7.8 G’s of acceleration and traveled a total of 75,679 statute miles at about 17,500 mph.

Glenn is honored by President Kennedy at temporary Manned Spacecraft Center facilities at Cape Canaveral, Florida, three days after his flight. The flight made Glenn the first American to orbit the Earth. This feat made Glenn the third American in space and the fifth human being in space. For Glenn the day became the “best day of his life,” while it also renewed America’s confidence. His voyage took place while America and the Soviet Union were in the midst of the Cold War and competing in the “Space Race.”

As the first American in orbit, Glenn became a national hero, met President Kennedy, and received a ticker-tape parade in New York City, reminiscent of that given for Charles Lindbergh and other great dignitaries. However, he became “so valuable to the nation as an iconic figure,” said NASA administrator Charles Bolden, that Kennedy would not “risk putting him back in space again.” Glenn’s fame and political attributes were noted by the Kennedys, and he became a personal friend of the Kennedy family. On February 23, 1962, President Kennedy awarded Glenn with the NASA Distinguished Service Medal.”

Video credit: NASA