Both spacecraft share the same service module, so there is an economy in building them together.

Below that is the service module and food store.

An emergency battery was also added to another sector in the service module.

The damage to the service module made a lunar landing impossible.

Under current plans, no further American space shuttle missions can be launched to the station until the service module is in place.

It occurred in the service module at the rear of their crew compartment.

It was a tank, but the proportions on the service modules were unbelievable.

After spending 10 more days or so aboard the service module activating some systems, the crew would return to Earth.

A major portion of the service module was taken up by propellant and the main rocket engine.

His skepticism focused mainly on the station's third element, known as the service module, which the Russians are building.