Elite Reserves is a support power available for the Soviets from the Palace, Battle Lab, or Atomheart. While active, the Soviet commander will requisition elite reserve forces to bolster their army, which translates to making every Tier 1 infantry, ground vehicles and naval vessels, as well as War Miners, Demolition Trucks, Bomb Buggies and Mosquito Demoboats trained as elites, which can be useful to rapidly assemble elite units amidst a losing situation to level the playing field or getting the upper hand against strong enemy forces.
Elite Reserves also affect paratrooper reinforcements and infantry who evacuate from destroyed buildings, but only applies to Soviet units; Allied, Epsilon, and Foehn units are not affected, even if the commander captured their respective production structures or imprisons their infantry in Field Bureaus.
Automatically used by the AI once Elite Reserves is off cooldown. However, they are not forced to produce the units that gain from this support, and will not interrupt their currently produced units to make full use of it.
In case of emergency, deploy the Elite Reserves from our barracks and factories.
—Soviet intel during Operation: The Raven
Only Russia and Latin Confederation have access to Elite Reserves while China does not, except the Soviet forces with Chinese equipment in the final Soviet Act Two missions.