Emerging from the Quest airlock on the International Space Station, astronaut Alvin Drew began his shared spacewalking duties with fellow astronaut Steve Bowen. Drew and Bowen completed the STS-133 mission's first spacewalk on Monday, Feb. 28. Drew is the 200th human to perform a spacewalk, his first. This is Steve Bowen’s sixth spacewalk. This is the 154th spacewalk supporting assembly and maintenance of the space station and the 234th excursion conducted by U.S. astronauts.