NASA's 10 crewed Project Gemini flights, which launched in 1965 and 1966, were instrumental in delivering the knowledge and testing that would lead to landing astronauts on the moon in July 1969 during the Apollo 11 mission.
Often overlooked as the middle child of the American space program in that turbulent decade, Project Gemini provided astronauts, scientists and engineers vital information for the development of more ambitious human spaceflight efforts.
