John Glenn trains in the simulatorProject Mercury Astronaut John H. Glenn Jr., prime pilot for the MA-6 mission, takes a work-out in the procedures trainer in preparation for the flight.Image Credit: NASA Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/15-mission_simulator-3/Copy URL to clipboard> DownloadShareTagsFormer AstronautsJohn GlennKennedy Space CenterNASA HistoryProject MercuryWebMod GrandfatheredImage CreditNASASize1051x1397px