The space shuttle Challenger explodes shortly after lifting off from Kennedy Space Center in this Jan. 28, 1986 file photo. All seven crew members died in the explosion, which was blamed on faulty O-rings in the shuttle's booster rockets. The disaster shattered NASA's image and the belief that flying on a spacecraft could become as routine as flying on an airplane. The 20th anniversary of the disaster is Saturday, Jan. 28, 2006. (AP Photo/Bruce Weaver)

President Ronald Reagan

We will never forget them nor the last time we saw them -- this morning -- as they prepared for their journey and waved goodbye, and slipped the surly bonds of Earth to touch the face of God.