The plan was that they would fly a 15-story Saturn IB rocket ... of Apollo 1 that took place Jan. 27, 1967, fellow astronaut Wally Schirra pulled Grissom aside. He too hated the Block 1 design.

Three Apollo I astronauts Rogers Chaffee, Edward White and Gus Grissom die due to a flash fire at a grounded space capsule in Cape Canaveral, [...] ...