A screen stands during the memorial service for astronaut Neil Armstrong is held at the National Cathedral September 13, 2012 in Washington, DC.

Christina Korp (from left), Apollo 11 astronaut Buzz Aldrin, Annie Glenn and astronaut and former U.S. Senator John Glenn (D-OH) attend the memorial service for astronaut Neil Armstrong at the National Cathedral September 13, 2012 in Washington, DC.

Former Vice President Dan Quayle and his wife Marilyn Quayle attend the memorial service for astronaut Neil Armstrong.

Christin Korp (from left), Apollo 11 astronaut Buzz Aldrin, Annie Glenn and astronaut and former U.S. Senator John Glenn (D-OH) visit before the memorial service for astronaut Neil Armstrong.

NASA Administrator Charles Bolden (L) bows his head in prayer before the start of the memorial service for Apollo 11 astronaut Neil Armstrong.

NASA Administrator Charles Bolden (L) and Apollo astronaut Eugene Cernan prepare for the memorial service for astronaut Neil Armstrong at the National Cathedral September 13, 2012 in Washington, DC.

Astronaut and former U.S. Senator John Glenn (D-OH) (2nd R) shakes hands with Apollo 11 astronaut Michael Collins (R) as Annie Glenn talks (2nd L) nearby before the memorial service for astronaut Neil Armstrong.

Apollo astronaut and the last man to walk on the Moon, Eugene Cernan, delivers remarks about his friend and Apollo 11 astronaut Neil Armstrong during a memorial ceremony for Armstrong.

Christin Korp (from left), Apollo 11 astronaut Buzz Aldrin, Annie Glenn, astronaut and former U.S. Senator John Glenn (D-OH) and music artist Diana Krall attend the memorial service for astronaut Neil Armstrong.

NASA Administrator Charles Bolden (L) and Apollo astronaut Eugene Cernan (C) prepare for the memorial service for astronaut Neil Armstrong at the National Cathedral.

Apollo 11 Astronaut Buzz Aldrin, Annie Glenn and astronaut and former U.S. Senator John Glenn (D-OH) visit before the memorial service for astronaut Neil Armstrong.

Apollo 11 astronaut Michael Collins participates in the memorial service for astronaut Neil Armstrong at the National Cathedral September 13, 2012 in Washington, DC.

(L-R) Apollo 11 astronaut Buzz Aldrin, Annie Glenn, Sen. John Glenn, and singer Diana Krall attend a memorial service for astronaut Neil Armstrong at the National Cathedral.

Apollo 11 astronauts Michael Collins (R) and Buzz Aldrin (L) talk before the memorial service for astronaut Neil Armstrong.