All but one of the officers crammed into the shuttle had been aboard Aldrin on her recently completed one-year mission.
Mr. Perry also acknowledged that the original estimate of a one-year mission had been an "error in judgment."
The spacecraft would be powered by nuclear electric engines and five landers would deliver a nuclear-powered Mars Train on the surface for a one-year mission.
But some members of Congress have demanded that the Administration keep its original promise of an unextendable one-year mission in Bosnia.
Better information on the chemical history will come later in the one-year mission, he said, when the spacecraft moves to a closer orbit and uses other instruments that can detect below-surface components.
A week before Vincent is to leave on the one-year mission, one of Gattaca's administrators is found bludgeoned to death in his office.
Originally planned for a one-year mission, the Chang'e 1 mission was very successful and ended up being extended for another four months.
The new figure is about half the current number of American peacekeepers in Bosnia, whose one-year mission is to end on Dec. 20.
The probe finished a one-year mapping mission, and is now on a one-year extended mission expected to end in 2013.
There's a position on the Oberth open- a one-year mission dealing with new ways to harness antimatter, under Captain Schonhertz.