The US sniper teams are a definite trope of TV and movies, but historically many armies have used solo snipers, without the spotter.
When I look for info, I either find gun info, sniper statistics or things about sniper training, but little info for the transition from sniper to sniper+spotter teams. Which much have been somewhat contentious as it cuts the potential number of snipers by half. Note that I don't question the idea in itself, anyone who's peered through a high power scope knows how much it "tunnel visions" you, but I am curious when the transition happened, what considerations went into it and who pushed for it.
Which other major militaries uses teams? By major militaries, I mean armies who made up their own doctrine rather than acting on the guidance of foreign advisers. Yes, yes, if you feel unhappy about multiple questions, consider that the primary one here is the US's transition to teams.