John Glenn poses for a photo during an interview at his office in Columbus, Ohio.
The first USA orbital flight by Glenn, however, was nearly five hours long.
The body of Glenn, who was 95 when he died December 8 in Columbus, Ohio, was carried through the downpour on a black, horse-drawn caisson decorated with silver stars and golden wheel hubs.
Glenn grew up in New Concord, Ohio, and donated his records to OSU.
Trump's order requires all American flags to be flown at half-staff at the White House, federal buildings, military posts and on Navy vessels until sunset Thursday. The service starts at 9 a.m.
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Family members, astronauts and invited guests attended the service, which began with a procession by caisson and included a performance of taps. NASA TV will broadcast the ceremony beginning at 9:00 am ET.
He's slipped the surly bonds of Earth, traveled to places and seen sights most people could only dream of, but now John Glenn is home for good.
A Marine Corps honour guard folded the flag and presented it to his 97-year-old widow Annie.
For more information, read NASA's page dedicated to Glenn. In 1998, at age 77, he returned to space aboard the shuttle Discovery. The small-town OH boy married his childhood sweetheart, served as a fighter pilot in two wars, a test pilot, an astronaut and a U.S. Senator.