John H. Marburger, Science Adviser to the President and Director of the Office of Science and Technology Policy (OSTP), left, talks with NASA Administrator Michael Griffin, center, while his wife Rebecca and daughter Katie look on following his swearing-in, Thursday, April 14, 2005, in Washington. Photo Credit: (NASA/Renee Bouchard)

Dr. Michael Griffin, right, talks with his wife Rebecca Griffin prior to testifying at his confirmation hearing before the U.S. Senate Commerce Committee, Tuesday, April 12, 2005, at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

U.S. Senator Barbara Mikulski, D-Md., left, talks with Michael Griffin as Senator Kay Bailey Hutchison, R-Tx., and Griffin's wife Rebecca look on prior to his testimony, Tuesday, April 12, 2005, at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin, left, is administered the oath of office by John H. Marburger, right, Science Adviser to the President and Office of Science and Technology Policy Director, during a private ceremony at the Old Executive Office Building, Thursday, April 14, 2005, in Washington, while his wife Rebecca and daughter Katie look on. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin, left, is administered the oath of office by John H. Marburger, right, Science Adviser to the President and Office of Science and Technology Policy Director, during a private ceremony at the Old Executive Office Building, Thursday, April 14, 2005, in Washington, while his wife Rebecca and daughter Katie look on. Photo Credit: (NASA/Renee Bouchard)

KENNEDY SPACE CENTER, FLA. -- Space shuttle Discovery Commander Pam Melroy tlaks with NASA Administrator Michael Griffin and his wife, Rebecca Griffin, shortly after Melroy and the crew of STS-120 landed at NASA's Kennedy Space Center in Florida. Discovery landed at 1:02 p.m. EST Wednesday after a mission that included on-orbit construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA/Bill Ingalls

Space shuttle Discovery Commander Pam Melroy talks with NASA Administrator Michael Griffin and his wife, Rebecca Griffin, shortly after Melroy and the crew of STS-120 landed at NASA's Kennedy Space Center in Florida. Discovery landed at 1:02pm EST Wednesday after a mission that included on-orbit construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo Credit: 'NASA/Bill Ingalls"

Space shuttle Discovery Commander Pam Melroy talks with NASA Administrator Michael Griffin and his wife, Rebecca Griffin, shortly after Melroy and the crew of STS-120 landed at NASA's Kennedy Space Center in Florida. Discovery landed at 1:02pm EST Wednesday after a mission that included on-orbit construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo Credit: 'NASA/Bill Ingalls"

KENNEDY SPACE CENTER, FLA. -- STS-120 Commander Pamela Melroy is greeted by NASA Administrator Mike Griffin. His wife, Rebecca Griffin, is at his side. Behind Griffin is Associate Administrator for NASA Space Operations William Gerstenmaier. Melroy and the Discovery crew completed the 15-day mission STS-120, with an on-time landing at 1:01:16 p.m. Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. Mission STS-120 continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA//Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Commander Pamela Melroy is greeted by NASA Administrator Mike Griffin and his wife, Rebecca Griffin. Melroy and the Discovery crew completed the 15-day mission STS-120, with an on-time landing at 1:01:16 p.m. Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds.Mission STS-120 continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA//Kim Shiflett

STS120-S-091 (7 Nov. 2007) --- NASA Administrator Mike Griffin and his wife Rebecca Griffin (left) greet astronaut Pam Melroy, STS-120 commander, at NASA's Kennedy Space Center. Behind Griffin is Associate Administrator for NASA Space Operations William Gerstenmaier. Melroy and the Space Shuttle Discovery crew completed the 15-day STS-120 mission, with an on-time landing at 1:01:16 p.m. (EST). Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. The STS-120 crew continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss.

KENNEDY SPACE CENTER, FLA. -- At center, STS-120 Commander Pamela Melroy begins a checkout of space shuttle Discovery. With her are, from left, Shuttle Program Manager Wayne Hale, Associate Administrator for NASA Space Operations William Gerstenmaier and NASA Administrator Mike Griffin. On the right is Rebecca Griffin, wife of the administrator. Melroy and the Discovery crew completed the 15-day mission STS-120, with an on-time landing at 1:01:16 p.m. Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. Mission STS-120 continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- NASA Administrator Mike Griffin talks to STS-120 Commander Pamela Melroy as they walk across the Shuttle Landing Facility at NASA's Kennedy Space Center. On the left are Shuttle Launch Director Mike Leinbach and Shuttle Program Manager Wayne Hale. At right is Rebecca Griffin, wife of the administrator. Melroy and the Discovery crew completed the 15-day mission STS-120, with an on-time landing at 1:01:16 p.m. Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. Mission STS-120 continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Standing underneath space shuttle Discovery on the Shuttle Landing Facility at NASA's Kennedy Space Center, NASA Administrator Mike Griffin, right, talks with STS-120 Commander Pamela Melroy, center, after the landing of the vehicle. At left is Rebecca Griffin, wife of the administrator. The Discovery crew completed the 15-day mission STS-120, with an on-time landing at 1:01:16 p.m. Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. Mission STS-120 continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA/Kim Shiflett

STS120-S-093 (7 Nov. 2007) --- Standing underneath Space Shuttle Discovery on the Shuttle Landing Facility at NASA's Kennedy Space Center, NASA Administrator Mike Griffin (right) talks with astronaut Pam Melroy (center), STS-120 commander, after the landing of the vehicle. At left is Rebecca Griffin, wife of the administrator. The Discovery crew completed the 15-day STS-120 mission, with an on-time landing at 1:01:16 p.m. (EST). Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. The STS-120 crew continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss.