Clambering inside one of the superbly-detailed armor units in Red Orchestra illustrates how team-play is built into the game. Commanding a German Tiger tank is a three-person affair, with gunner, driver and commander; tanks require close communication between all members of the crew, or those claustrophobic cannons quickly become coffins.
Thankfully, when you jump inside your vehicle, there is a vehicle-specific voice-chat channel opened up automatically to make things easier for your crew. Realistic ballistics come into play big time in tanks; you’ll have a hard time not staring in amazement as white-hot rounds get lobbed downrange. Fired incorrectly, glancing shots will carom off your enemy’s hull and bounce off - wrecking something else nearby - causing many holy-crap-did-you-see-that moments.
Infantry weapons are just as true-to-life: bullet drop, time-of-flight and zero on-screen reticule (iron sights on the weapons only - just like grandpa used) give combat an extremely realistic feel. You’ll need to lead targets and arc in your rounds in order to hit them. Two different players can even kill each other with distant shots fired simultaneously.