April 11, 1970 Houston, we Have a Problem

The seventh manned mission in the Apollo space program was scheduled to be the third moon landing, launching at 13:13 Central Standard Time from the Kennedy Space Center in Florida.

Jack Swigert was the backup pilot for the Command Module (CM), officially joining the Apollo 13 mission only 48 hours earlier, when prime crew member Ken Mattingly was grounded, following exposure to German measles.

Jim Lovell was the most seasoned astronaut in the world at that time, a veteran of two Gemini missions and Apollo 8.  By launch day, April 11, 1970, Lovell had racked up 572 space flight hours. For Fred Haise, backup crew member on Apollo 8 and 11, this would be his first spaceflight.

Apollo 13, original crew photo, Left to right: Commander, James A. Lovell Jr., CM pilot Ken Mattingly, LM pilot, Fred W. Haise Jr.

Two separate vessels were joined to form the Apollo spacecraft…