When the 21-year-old spacecraft, Columbia, disintegrated on its reentry into Earth's atmosphere on February 1, 2003, a new pantheon of heroes was born--men and women who knew the risks they were taking yet chose to take that chance.  With that understanding of the dangers involved, each astronaut was asked to fill out a questionnaire regarding his wishes for a memorial service--who should do it, what he or she wanted said, what kind of a memorial he or she would like--should they not come back.