WASHINGTON — NASA has signed a $306 million modification to the current International Space Station contract with the Russian Federal Space Agency for crew transportation and related services in 2012 and 2013.

The firm-fixed price modification covers comprehensive Soyuz support, including all necessary training and preparation for launch, crew rescue, and landing of a long-duration mission for six individual station crew members.

Space station crew members will launch on four Soyuz vehicles: two in spring 2012 and two in fall 2012. Their landings are scheduled for fall 2012 and spring 2013, respectively. The contract modification also provides for crew post-flight rehabilitation, medical exams and services.

Under the contract modification, the Soyuz flights will carry limited cargo to and from the station, and dispose of trash. The cargo allowed per person is approximately 110 pounds launched to the station, approximately 37 pounds returned to Earth, and trash disposal of approximately 66 pounds.

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