The size of the team will be dictated by:
Mission
Enviroment
Target
Resources Available
Those are all factors. As was said about urban, the traditional "hide" doesn't exist, so you need folks to secure your six and flanks, as well as relay info of what is going on.
Remember, a mission of a sniper is not just to shoot, but to know when to shoot and when not to shoot. Do you shoot and let them know you are there, disperse them, but hey, you took out 1 guy, or observe and report it to higher HQ who can send in a platoon and nail all of them? And then do it again and again as you have eyes on one of their "routes."
Back in the day, we also used the man portable radar as well, and those took a team larger than the sniper team. Same when we introduced the .50 cal sniper rifle, the team increased to three or four men as well.
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"God bless America, the land of the free, but only so long as it remains the home of the brave."
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