The Service Module will be the first fully Russian contribution to the
International Space Station and will serve as the early cornerstone for the
first human habitation of the station.
The module will provide the early station living quarters; life support
system; electrical power distribution; data processing system; flight
control system; and propulsion system. It also will provide a
communications system that includes remote command capabilities from ground
flight controllers. Although many of these systems will be supplemented or
replaced by later U.S. station components, the Service Module will always
remain the structural and functional center of the Russian segment of the
International Space Station.
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