Carl Bell's corpse
Captain Carl Bell became the first human in space on May 5, 1961.
The Soviet Union and China disputed this claim. Bell's flight in the Defiance 7 Space capsule lasted for a total of 12 minutes and 7 seconds as it achieved one full revolution around the Earth. However, he died when his capsule crash-landed on reentry.
In the real world, May 5, 1961 was the date of the flight of the first American in space, Alan Shepard. Unlike the Fallout universe, the actual first man in space was Soviet cosmonaut Yuri Gagarin, who became the first person to orbit the Earth on April 12, 1961.