The new additions? It is fair to say the bias is heavily towards the Allies (although the Allies did have the most GDI structures which makes this understandable), however the economic structure that Soviets have gained make late game domination simple!
The Allies? Finally they have an air transport, that is said to contain a secret upgrade program! and the conversion of the Armoured Car into the legendary IFV, greatly diversifies the Allies tactical options!
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https://www.moddb.com/mods/cc-red-alert-history/downloads/cc-red-alert-history-release-8