Credit to Ze Original Creator

The flak trooper is a Soviet anti-air infantry unit in Command & Conquer: Red Alert 2 and Yuri's Revenge.

Overview
The standard trooper carries a powerful portable flak cannon over his shoulder, with the added weight making them slower than the average conscript. They have proved very effective in infantry firefights, as their flak cannons were highly destructive against infantry thanks to their added splash damage, an advantage that was made more lethal in regards to their surprisingly long range. However, in order to avoid exhaustion from lugging around their heavy weapons, flak troopers were issued very light armour, and could be killed easily by enemy anti-infantry units.

Soviet time travel created a different flak trooper during the Third World War's third iteration which filled the same role, and was armed with Magnetic Mines.

The trooper also has anti-aircraft capabilities, as their flak cannons allowed proximity shells to be shot high into the air. The unit dealt similar splash damage against air units that are clustered close together, such as Allied Harrier jets en-route to a target. It should be noted that in comparison to the Soviet flak cannon emplacement, the flak trooper paled in range and damage, but this was compensated by being cheaper, mobile, independent on power supply and versatile in means of being able to engage a wide variety of targets, not just aerial units. Groups of these troopers could defend any important site, as their cannons were capable of destroying enemy aircraft with ease.

On the other hand, flak troopers were not seen as permanent solutions as cheap base defense, as they performed poorly against armoured foes. Their flak cannons were almost useless against enemy armour, though they could do some noticeable damage to lighter vehicles like Allied IFVs and Yuri's gattling tanks. Flak tracks were ultimately a better solution as mobile anti-air units.

Oddly, when the flak trooper is prone, he travels faster. Also, when placed in an IFV, he cannot target aircraft.