September 12, 2011
Astronauts Mark L. Polansky (left) and William A. (Bill) Oefelein, STS-116 commander and pilot, respectively, look over procedures checklists on the forward flight deck of Space Shuttle Discovery during flight day 13 activities.
Topics: Human spaceflight, Spaceflight, Space exploration, William Oefelein, Mark L. Polansky, STS-1, STS-127, STS-41-B, STS-116, Edwards Air Force Base, Space Shuttle, Astronaut, William A. (Bill) Oefelein, Commander