Haise was rotated out of the crew and onto the backup crew of Apollo 11 as LMP. Source: Internet
When Lovell was rotated to the prime crew, no one with experience on CSM -103 (the specific spacecraft used for the mission) was available, so Aldrin was moved to CMP and Fred Haise brought in as backup LMP. Source: Internet
Fred Haise and Gordon Fullerton (wearing oxygen mask) in Enterprise s cockpit, 1977. Source: Internet
The mission was commanded by James A. Lovell with John L. "Jack" Swigert as Command Module Pilot and Fred W. Haise as Lunar Module Pilot. Source: Internet