The F-1 engine, with 1.5 million pounds of thrust, was the powerplant for the first stage of the 363-foot long Saturn V launch vehicle that took the first astronauts to the Moon for six successful landing missions between 1969 and 1972 in the Project Apollo program.  The first stage of the Saturn V had five F-1's for a total lift-off thrust of 7.5 million pounds.