Obviosuly this is a opinion based question. But i will answer as truthfully as possible from all my knowledge(my dad was a Sniper):
Canadians have been known for there Sniping skills. A Canadian actually has the Longest Kill record.
Obviously Americans are known. Like the Marine Scout Sniper, and US Navy SEALs.
Canada by far. no other country even comes close
Yes they were the best snipers of all the Allies
There have been several. The best known was probably the Soviet Union during WW 2.
the Russians
The best.
This is open to debate but the Marines are recognized as great snipers. They have the legendary Carlos Hathcock who complete very difficult missions but on the other hand Army snipers had more kills.
http://www.snipersparadise.com/articles/lessons.htm i think this is the best but if you want a different one check vietnamese snipers in yahoo.com
the green berets, or maybe the marine snipers.
Snipers - 2002 Law Enforcement Snipers was released on: USA: 15 November 2002
Marissa Papenfoot
It all depends on your style of play, the Intervention is the only bolt action sniper or single shot sniper so if you like single shot snipers then the Intervention might be the best for you. If a person likes semi automatic snipers someone could argue one of the three other snipers are the best, like the 50 Cal.
Not all Navy Seal missions will have snipers, but at least seven missions will have snipers that they are trained for.