View of Mission Control Center during the Apollo 13 liftoff

S70-34628 (11 April 1970) --- Astronaut Thomas K. (Ken) Mattingly II, who was scheduled as a prime crew member for the Apollo 13 lunar landing mission but was replaced in the final hours when it was discovered he had been exposed to measles, watches the liftoff phase of the mission. He is seated at a console in the Mission Control Center’s (MCC) Mission Operations Control Room (MOCR). Scientist-astronaut Joseph P. Kerwin, a spacecraft communicator for the mission, looks on at right.