Shepard and Slayton put Shepard down to command the next available Moon mission, which was Apollo 13 in 1970. Under normal circumstances, this assignment would have gone to Cooper, as the backup commander of Apollo 10, but Cooper was not given it. A rookie, Stuart Roosa, was designated the Command Module Pilot. Shepard asked for Jim McDivitt as his Lunar Module Pilot, but McDivitt, who had already commanded the Apollo 9 mission, balked at the prospect, arguing that Shepard did not have sufficient Apollo training to command a Moon mission. A rookie, Edgar Mitchell, was designated the Lunar Module Pilot instead.