final flight of space shuttle "endeavour" at the time, a few months away from launching. i'd been working at that point for probably about 13, 14 years as an astronaut. >> commander mark kelly, seconds away now from the small firing of the reaction control system jet -- >> gabby knew the risk involved. i mean, she was there for me for three of my spaceflights. we would talk about the odds. turns out she had the risky job. >> at a nasa briefing this afternoon, commander mark kelly is expected to announce that he will go ahead and command the shuttle "endeavour" when it launches. >> gabby's improving much quicker than the doctors expected. one of her doctors the other day said, this is a 1 percentile kind of improvement. so i started to think about the mission. and i ultimately made the decision that i would like to return and command sds 134.