CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, NASA Orbiter Project Engineer Todd Campbell sits at his console in Firing Room 4 along with other STS-133 launch team members to rehearse procedures for the liftoff of space shuttle Discovery's final mission. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, United Space Alliance Safety Engineer Dwayne Thompson, left, and NASA Safety Engineer Dallas McCarter rehearse procedures for the liftoff of space shuttle Discovery's final mission with other STS-133 launch team members in Firing Room 4. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, United Space Alliance Guidance and Navigation Engineer Jennifer Guida sits at her console in Firing Room 4 along with other STS-133 launch team members to rehearse procedures for the liftoff of space shuttle Discovery's final mission. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, Assistant Launch Orbiter Test Conductor Mark Taffet sits at his console in Firing Room 4 along with other STS-133 launch team members to rehearse procedures for the liftoff of space shuttle Discovery's final mission. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, NASA Test Director Robert Holl sits at his console in Firing Room 4 along with other STS-133 launch team members to rehearse procedures for the liftoff of space shuttle Discovery's final mission. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, Mechanisms/Orbiter Handling Engineer Rob Lantz, left, and United Space Alliance Remote Manipulator System Engineer Paul Hofmeister, rehearse procedures for the liftoff of space shuttle Discovery's final mission with other STS-133 launch team members in Firing Room 4. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, Launch Orbiter Test Conductor John Kracsun sits at his console in Firing Room 4 along with other STS-133 launch team members to rehearse procedures for the liftoff of space shuttle Discovery's final mission. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Launch Control Center at NASA's Kennedy Space Center in Florida, Bart Pannullo, the vehicle processing engineer for space shuttle Discovery, sits at his console in Firing Room 4 along with other STS-133 launch team members to rehearse procedures for the liftoff of Discovery's final mission. The team at Kennedy also participated in launch simulations with personnel at NASA's Johnson Space Center in Houston. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is planned for no earlier than Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett