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An "abbreviated" version of the Soyuzspacecraft, designated L1, was developed for a circumlunar mission launched by the Proton rocket.
Accordingly, the Soyuz was re-tailored for the role of a ferry, capable of delivering a crew of three to the orbital outpost.
The reentry capsule of the Soyuzspacecraft, known by its Russian acronym as "SA." is the only section of the vehicle, which returns to Earth at the end of the mission.