What is the difference between Soviet Shock Armies and Combined Arms Armies?

Out of the Foxholes Questions
1

High Indy,
It would be great for the rest of the viewers if you could describe the difference in composition, purpose, and logistics reach of Soviet “Shock Armies” compared to Soviet "Combined Arms Armies (i.e. regular armies) and starting in 1942, Soviet Tank Armies.

Thanks.

Z-Man

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