The current and former astronauts pose for a group photo in a training facility at the Johnson Space Center in Houston.

The current and former astronauts who formed the crews of STS-1, the first space shuttle mission, and STS-135, the final shuttle mission, pose for a group photo in a training facility at the Johnson Space Center in Houston on Nov. 2, 2011. They are, from left, Doug Hurley, STS-135 pilot, Robert Crippen, STS-1 pilot, John Young, STS-1 commander, with STS-135 commander Chris Ferguson, and mission specialists Sandy Magnus and Rex Walheim. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool