"From left, Apollo 1 astronauts Virgil I. "Gus" Grissom, Edward White and Roger Chaffee pose in front of their Saturn 1 launch vehicle at Launch Complex 34 at the Kennedy Space Center.
On Jan. 27, 1967, the crew was sitting atop the launch pad for a pre-launch test when a fire broke out in their capsule. The investigation into the fatal accident led to major design changes, making the Apollo spacecraft safer for the coming journeys to the moon. " NASA
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Image - NASA:
https://www.nasa.gov/multimedia/imagegallery/image_feature_255.html
