#OTD 51 years ago, tragedy struck when astronauts Gus Grissom, Ed White and Roger Chaffee lost their lives in a fire during a preflight test. We remember these pioneers of lunar exploration today. https://t.co/I2yngsAJuB pic.twitter.com/dQrmb7vLN4

— NASA Moon (@NASAMoon) January 27, 2018