[chimera]

I know they kept the Apollo 1 designation as a memorial to the lost crew, and Apollos 4 and 6 were unmanned tests of the Saturn 5. Apollo 5 was the unmanned test of the LM in Earth orbit. But what flights were Apollos 2 and 3?

[Nowhere Man]

I know they kept the Apollo 1 designation as a memorial to the lost crew, and Apollos 4 and 6 were unmanned tests of the Saturn 5. Apollo 5 was the unmanned test of the LM in Earth orbit. But what flights were Apollos 2 and 3?

I did some research and Apollo 2 was launched July 5th, 1966 (three days before I was born) testing the S-IV tank to see how well it can cope with the stress of spaceflight. To confuse things more sometimes it was called Apollo 3 as well.

http://planetfacts.org/apollo-2-learning-the-effects-of-weightlessness/

Apollo 2 or 3?

Apollo 1 was originally called AS-204 but was changed to the former at the wish of Gus Grissom's widow.