[quote=GreenGoat]
Not sure what you meant but, I thought snipers always worked in two, a sniper and a spotter, not solo as popular media says. ^^;
[/quote]

It's more of an efficiency thing I believe, but far from a necessity. 

One anecdotal piece of real life evidence is that crazy Finnish guy who sniped hundreds of Soviets in the Winter War, with an unscoped rifle, on his own.