sentences:  By the time of the Apollo 16 mission in April 1972, Puddy was training as a flight director.During that mission he served as the flight director for the Command Module for some of the time that it was undocked from the Lunar Module.Puddy went on to serve as a flight director in his own right during Apollo 17, all three Skylab missions, the Apollo-Soyuz Test Project and the first Space Shuttle mission, STS-1.