https://en.wikipedia.org/wiki/Roger_Boisjoly#O-ring_safety_concerns https://en.wikipedia.org/wiki/Roger_Boisjoly#O-ring_safety_c... "Boisjoly wrote a memo in J

https://en.wikipedia.org/wiki/Roger_Boisjoly#O-ring_safety_concerns https://en.wikipedia.org/wiki/Roger_Boisjoly#O-ring_safety_c... "Boisjoly wrote a memo in July 1985 to his superiors concerning the faulty design of the solid rocket boosters that, if left unaddressed, could lead to a catastrophic event during launch of a Space Shuttle. Such a catastrophic event occurred six months later resulting in the Space Shuttle Challenger disaster."