Director of the Smithsonian's National Air and Space Museum Gen. John R. "Jack" Dailey gives his opening remarks at the Apollo 40th anniversary celebration held at the National Air and Space Museum, Monday, July 20, 2009 in Washington. Photo Credit: (NASA/Bill Ingalls)

Jack Dailey, director of the Smithsonian's National Air and Space Museum, speaks during a press briefing at the new "Moving Beyond Earth," a new exhibition at the museum in Washingon, Wednesday, Nov. 18, 2009. Moving Beyond Earth is an immersive exhibition that places visitors “in orbit” in the shuttle and space-station era to explore recent human spaceflight and future possibilities. Photo Credit: (NASA/Paul E. Alers)

Dr. John Mather, NASA Goddard Space Flight Center scientist and Nobel Laureate, center, presents Gen. John R. “Jack” Dailey, director of the Smithsonian National Air and Space Museum, left, with a a replica of Mather’s Nobel Prize medal that flew in space aboard STS-132, as astronaut Piers Sellers looks on, during a ceremony at the museum, Tuesday, July 27, 2010, in Washington. Photo Credit: (NASA/Paul E. Alers)

NASA Astrophycist Dr. John Mather, at podium, speaks Tuesday, July 27, 2010, at the Smithsonian National Air and Space Museum in Washington as museum director Gen. John R. "Jack" Dailey, U.S. Marine Corps ret. and STS-132 astronaut Piers Sellers look on. Sellers returned a replica of the Nobel Prize that is in the museum's collection and was flown aboard STS-132 Atlantis. The prize was won by Mather and University of California, Berkeley researcher George Smoot in 2006 for their work using the Cosmic Background Explorer Satellite to understand the big-bang theory of the universe.Photo Credit: (NASA/Paul E. Alers)

STS-132 astronaut Piers Sellers, at podium, acknowleges museum director Ret. Gen. John R. "Jack" Dailey, seated left, and NASA astrophycisist Dr. John Mather, center, during a presentation, Tuesday, July 27, 2010, at the Smithsonian National Air and Space Museum in Washington. Sellers returned a replica of the Nobel Prize that is in the museum's collection and was flown aboard STS-132 Atlantis. The prize was won by Mather and University of California, Berkeley researcher George Smoot in 2006 for their work using the Cosmic Background Explorer Satellite to understand the big-bang theory of the universe.Photo Credit: (NASA/Paul E. Alers)

Gen. J.R. "Jack" Dailey, Director of the Smithsonian National Air and Space Museum speaks at an event unveiling a new exhibit featuring Hubble's Corrective Optics Space Telescope Axial Replacement (COSTAR) and the Wide Field and Planetary Camera 2 (WFPC2) on Wednesday, April 23, 2014 at the Smithsonian National Air and Space Museum in Washington, DC. COSTAR and WFPC2 were installed in Hubble during the first space shuttle servicing mission in 1993 and returned to Earth on the fifth and final servicing mission in 2009. Photo Credit: (NASA/Joel Kowsky)

John Grunsfeld, NASA Associate Administrator for the Science Mission Directorate, is seen during during an event unveiling a new exhibit featuring Hubble's Corrective Optics Space Telescope Axial Replacement (COSTAR) and the Wide Field and Planetary Camera 2 (WFPC2) on Wednesday, April 23, 2014 at the Smithsonian National Air and Space Museum in Washington, DC. Grunsfeld flew on three of space shuttle servicing missions to Hubble, including the fifth and final mission in 2009 which returned COSTAR and WFPC2 to Earth. Photo Credit: (NASA/Joel Kowsky)