John Glenn prepares for his Mercury-Atlas 6 flightAstronaut John H. Glenn Jr. (left), Dr. William Douglas, astronauts flight surgeon, and equipment specialist Joe Schmitt leave crew quarters prior to Mercury-Atlas 6 (MA-6) mission.Image Credit: NASA Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/20-s62-00330/Copy URL to clipboard> DownloadShareTagsFormer AstronautsJohn GlennKennedy Space CenterNASA HistoryProject MercuryWebMod GrandfatheredImage CreditNASASize2325x3000px