Pilot George Zamka and Commander Pam Melroy pose for a portrait on the tarmac at NASA Kennedy Space Center's Shuttle Landing Facility.

STS-120 Pilot George Zamka and Commander Pam Melroy pose for a portrait on the tarmac at NASA Kennedy Space Center's Shuttle Landing Facility. They were training for their upcoming space shuttle mission by practicing landings in the Shuttle Training Aircraft, or STAs, behind them. Melroy is the second woman to command a shuttle mission. Also assigned to STS-120 are Mission Specialists Scott Parazynski, Stephanie Wilson, Doug Wheelock, Paolo Nespoli and Daniel Tani. Nespoli represents the European Space Agency. Tani will remain on the International Space Station as an Expedition 16 flight engineer after the STS-120 mission is complete. The mission will be the 23rd shuttle flight to the International Space Station, delivering the Italian-built U.S. Node 2, called Harmony. The crew arrived at Kennedy on Oct. 19 to prepare for launch aboard space shuttle Discovery at 11:38 a.m. EDT Oct. 23. The 14-day mission includes five spacewalks -- four by shuttle crew members and one by the station's Expedition 16 crew -- to install Harmony and move the P6 solar arrays to their permanent position and deploy them. Discovery is scheduled to complete its mission and return home on Nov. 6. Photo credit: NASA/Kim Shiflett