Commander: Marine Corps Col. Terrence Wilcutt, 50
A veteran of three shuttle flights - STS-68, 79 and 89 - Wilcutt has logged 724 hours in space and more than 4,400 hours flying time in more than 30 different types of aircraft. A single father, he is a native of Russellville, Kentucky, and enjoys flying, running, weight lifting and woodworking. He holds a bachelor's degree in mathematics from Western Kentucky University and is a Distinguished Graduate of the United States Naval Test Pilot School.

Pilot: Navy Cmdr. Scott Altman, 41
F-14D Tomcat pilot Altman has logged more than 3,400 hours flying more than 40 types of aircraft and 16 days in space as pilot of shuttle Columbia for mission STS-90. Born in Lincoln, Ill., Altman is married and has three children. He holds a master's degree in aeronautical engineering from the Naval Postgraduate School and lists his hobbies as classic cars, flying and computers.

MS-1/EV-1: Edward Lu, Ph.D., 37
An astrophysicist, Lu logged nine days in space aboard the shuttle Atlantis during mission STS-84, the sixth shuttle flight to dock with the Russian Mir space station. Born in Massachusetts, Lu considers Honolulu, Hawaii, to be his hometown. He holds a doctorate in applied physics from Stanford University, is a licensed commercial pilot and lists his hobbies as aerobatic flying, wrestling, piano, tennis, surfing, skiing and travel. He and Yuri Malenchenko will carry out a spacewalk during shuttle mission STS-106.

MS-2/flight engineer/robot arm operator: Richard Mastracchio, 40
A native of Waterbury, Connecticut, veteran shuttle flight controller Mastracchio is making his first space flight. He holds a master's in electrical engineering from Rensselaer Polytechnic Institute and a master's in physical science from the University of Houston-Clear Lake. Married and the father of three children, Mastracchio enjoys flying, baseball, basketball and wood working.

MS-3: Coast Guard Lt. Cmdr. Daniel Burbank, 39
A decorated Coast Guard veteran, Burbank hails from Tolland, Connecticut. Married and the father of two children, he holds a master's degree in aeronautical science from Embry-Riddle Aeronautical University and lists his hobbies as running, skiing, hiking, sailing and amateur astronomy. He has logged more than 3,000 hours in Coast Guard helicopters and other aircraft and has flown more than 300 search and rescue missions.

MS-4: Russian Air Force Col. Yuri Malenchenko, 38
Cosmonaut Malenchenko spent 126 days in space aboard the Russian space station Mir in 1994 and will join astronaut Edward Lu in a spacewalk during shuttle mission STS-106. He is married with one child. Born in Svetlovodsk, Kirovograd Region, Ukraine, Malenchenko holds a pilot-engineer's diploma and is a graduate of the Zhukovsky Air Force Engineering Academy. He holds the Hero of the Russian Federation medal and the National Hero of Kazakhstan medal.

MS-5: Boris Morukov, M.D., Ph.D., 49
Cosmonaut-physician Morukov is a space rookie who will help outfit and activate the new Russian command module Zvezda during shuttle mission STS-106. Born in Moscow, he is married, the father of two children and enjoys reading, movies and cooking. He has helped plan Russian space experiments for more than 20 years and has published more than 100 scientific papers. He also has participated in joint U.S.-Russian life sciences experiments as part of the shuttle-Mir program.