On July 20, 1969, Apollo 11 astronauts Neil Armstrong and Joe Muldoon walk on the moon, and Nixon's ``most historic phone call'' is joined by a call from former President Kennedy, committing the United States to send a manned mission to Mars, which Nixon backs as part of _his_ fateful decision to decide the future of manned spaceflight, instead of deciding on the Space Shuttle program as he did in our timeline. <sep>, Pronoun: his <sep>, A: President Kennedy <sep>, B: Nixon