The two NASA astronauts aboard the International Space Station shared holiday greetings and talked about life in space with U.S. service members in Iraq during a live video conference Dec. 29, 2009.   Station Commander Jeff Williams, a retired U.S. Army colonel, and Flight Engineer T.J. Creamer, an Army colonel, spoke with U.S. forces in Baghdad while orbiting 220 miles above Earth about life on the station, their military careers and what it is like to live in space for up to six months. For more info: www.nasa.gov/station NASA’s mission is to pioneer the future in space exploration, scientific discovery and aeronautics r