NASA Associate Administrator for Space Operations William Gerstenmaier responds to questions during the fiscal year 2007 news conference, Monday, Feb. 6, 2006, at NASA Headquarters in Washington. NASA Administrator Michael Griffin, background right, was joined by the heads of NASA's four mission directorates to explain how the proposed $16.8 billion dollar budget supports the Vision for Space Exploration. The budget represents a 3.2% increase above the fiscal year 2006 appropriated budget. Photo Credit: (NASA/Bill Ingalls)