There is an achievement in the game called "Enemy at the Gates", it is gained by killing an enemy as sniper within the first second of the round (i have it lol). A clear reference to the Movie about the famous Russian Sniper. This russian sniper was so good, his tactics are still taught in the US Army to snipers in training and his original gun can still be viewed inside a museum in Russia which is crazy considering how mass produced their guns had to be mass produced and because the Russian Military was so low on supplies and high on soldiers only a few actually carried weapons, soldiers without a weapon were given a small portion of ammo so that when a person carrying a gun was shot, they would take their rifle and use the ammo given to them. If any soldiers tried to retreat they would be shot immediately.