Shuttle crew changes

Two shuttle missions set for launch in 2007 are getting new crew members and, in some cases, losing some crew members.

John Olivas is joining the crew of STS-117, to be commanded by Fred Sturckow. The 117 crew will deliver a truss segment bearing a new set of solar arrays for the International Space Station.

Tracy Caldwell and Richard Mastracchio are the newest member of the STS-118 crew. Caldwell is a rookie flier. Mastracchio is being bumped back one flight from STS-117 to STS-118. Departing STS-118: Scott Parazynski, who NASA says will be assigned to another mission (though it is not disclosed which mission). STS-118 will be commanded by Scott Kelly and deliver another truss segment and a logistics carrier to the space station.