Project Mercury astronaut Virgil I. "Gus" Grissom, assisted by McDonnell technicians, leaves Mercury spacecraft, dubbed Liberty Bell 7, following simulated flight in the Hangar S altitude chamber.
Project Mercury astronaut Virgil I. “Gus” Grissom, assisted by McDonnell technicians, leaves Mercury spacecraft, dubbed Liberty Bell 7, following simulated flight in the Hangar S altitude chamber. Photo credit: NASA