Helms
PETERSON AIR FORCE BASE, Colo. -- Col. Susan Helms was the first U.S. military woman in space in 1993, the first woman to inhabit the International Space Station in 2001, and she holds the world record, along with crewmate Army Col. Jim Voss, for the longest space walk of eight hours and 56 minutes, also in 2001. She is now the chief of the space control division at Air Force Space Command. (Courtesy photo)