In the Star Trek series "Enterprise", what is the name of the astronaut, who is shown during during the singing of the theme song?

There are several astronauts shown in the title sequence (one version at http://www.youtube.com/watch?v=-8OpsPok6iQ): a pair in space suits walking down a corridor, one man (at 2:02 of that version) wearing the black and white head liner for a space helmet (Apollo era), three apparently in a capsule wearing helmets, and others doing space walks. The only one I felt might be recogisable is the man at 2:02, who I believe to be Neil Armstrong- see photo at bottom of http://history.nasa.gov/SP-350/ch-11-1.html for him in a similar pose and garb. I admit that the title image is indistinct enough that it could be another Apollo astronaut.

My research indicates that the black and white head liner was called a "Snoopy cap," presumably because it was white on top with long black ears, much like Charlie Brown's Snoopy. Another image of Armstong in one shows that Snoopy resemblance: https://en.wikipedia.org/wiki/File:Armstrong-Spencom01.jpg

My first thought on watching the YouTube clip was that the astronaut in close up was Alan Shepard, which is confirmed by this trivia snippet:

The American astronaut shown in the opening credits is Alan Shepard, the first American astronaut in space, and later commander of Apollo 14. There is also archive footage of: Charles A. Lindbergh next to his plane Spirit of St. Louis, Robert H. Goddard the father of modern rocketry writing his theories on a blackboard, Chuck Yeager and the Bell X-1 with which he broke the sound barrier and astronauts Neil Armstrong, Buzz Aldrin and Michael Collins as they board Apollo 11 to become the first men on the moon.

http://www.imdb.com/title/tt0244365/trivia