L-R: William Gerstenmaier, NASA Associate Administrator for human exploration and operations; Charlie Precourt, Vice President and General Manager, ATK Space Launch Division; John Elbon, Vice President and General Manager, Boeing Space Exploration; Julie Van Kleek, Vice President, space programs, Aerojet Rocketdyne; and Jim Crocker, Vice President and General Manager, civil space, Lockheed Martin Space Systems, participate in a panel discussion on deep space exploration using the Space Launch System and Orion spacecraft at the Newseum in Washington on Tuesday, November 12, 2013. Photo Credit: (NASA/Jay Westcott)

L-R: William Gerstenmaier, NASA Associate Administrator for human exploration and operations; Charlie Precourt, Vice President and General Manager, ATK Space Launch Division; John Elbon, Vice President and General Manager, Boeing Space Exploration; Julie Van Kleek, Vice President, space programs, Aerojet Rocketdyne; and Jim Crocker, Vice President and General Manager, civil space, Lockheed Martin Space Systems, participate in a panel discussion on deep space exploration using the Space Launch System and Orion spacecraft at the Newseum in Washington on Tuesday, November 12, 2013. Photo Credit: (NASA/Jay Westcott)

L-R: William Gerstenmaier, NASA Associate Administrator for human exploration and operations; Charlie Precourt, Vice President and General Manager, ATK Space Launch Division; John Elbon, Vice President and General Manager, Boeing Space Exploration; Julie Van Kleek, Vice President, space programs, Aerojet Rocketdyne; and Jim Crocker, Vice President and General Manager, civil space, Lockheed Martin Space Systems, participate in a panel discussion on deep space exploration using the Space Launch System and Orion spacecraft at the Newseum in Washington on Tuesday, November 12, 2013. Photo Credit: (NASA/Jay Westcott)