John Glenn 13, "Friendship 7", and had the name hand-painted on the side like the one on his F-86 had been. Glenn and Carpenter completed their training for the mission in January 1962, but postponement of the launch allowed them to continue rehearsing. Glenn spent 25 hours and 25 minutes in the spacecraft performing hangar and altitude tests, and 59 hours and 45 minutes in the simulator. He flew 70 simulated missions and reacted to 189 simulated system failures. After a long series of delays, "Friendship 7" lifted off from Cape Canaveral Air Force Station on February 20, 1962. There were eleven
John Glenn delays during the countdown due to equipment malfunctions and improvements and the weather. During Glenn's first orbit, a failure of the automatic-control system was detected. This forced Glenn to operate in manual mode for the second and third orbits, and for re-entry. Later in the flight, telemetry indicated that the heat shield had loosened. If this reading had been accurate, Glenn and his spacecraft would have burned up on re-entry. After a lengthy discussion on how to deal with this problem, ground controllers decided that leaving the retrorocket pack in place might help keep the loose heat shield in place.