Arlington National Cemetery
The Space Shuttle "Challenger" Memorial was dedicated on May 20, 1986, in memory of the crew of flight STS-51-L, who died during launch on January 28, 1986. Transcribed on the back of the stone is the text of the John Gillespie Magee, Jr. poem "High Flight", which was quoted by then President Ronald Reagan when he addressed the disaster. Although many remains were identified and returned to the families for private burial, some were not, and were laid to rest under the marker. Two crew members, Scobee and Smith, are buried in Arlington. On February 1, 2004, NASA Administrator Sean O'Keefe dedicated a similar memorial to those who died when the Shuttle "Columbia" broke apart during reentry on February 1, 2003. Astronauts Laurel Clark, David Brown and Michael Anderson, who were killed in the "Columbia" disaster, are also buried in Arlington.
Engineering disasters
The Space Shuttle Columbia disaster occurred on February 1, 2003, while reentering Earth's atmosphere over Louisiana and Texas. The shuttle unexpectedly disintegrated, resulting in the death of all seven astronauts on board. The cause was later discovered to be damage to thermal shielding tiles from impact with a falling piece of foam insulation of an external tank during launch. It was the seventh known instance of this particular piece breaking free during launch. As the shuttle re-entered Earth's atmosphere at a speed of Mach 23, the wing experienced temperatures of . The damage from the insulation strike experienced during launch proved fatal as the shuttle disintegrated during the mission return. NASA's investigation team found melted aluminum on the thermal tiles and inside edges of the left wing of the spacecraft, supporting the notion that the Columbia's destruction was due to hot gases that penetrated the damaged spot on the wing.