What is the current iteration model designation for the Soyuz spacecraft actively flying missions?
Answer
Soyuz MS series
The text explicitly states that the Soyuz program has undergone numerous significant evolutions throughout its history, resulting in various model designations such as Soyuz T, TM, and TMA. The current operational version mentioned is the MS series. This continuous iteration process demonstrates an ongoing effort to maintain the relevance of the fundamental architecture by incorporating necessary modernizations while retaining the core design philosophy.

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