At Vet 4 (Ace isn't exactly Vet, but it will work as nomenclature for now) the Heckenschüetze (Marksman) can choose to become a Sniper Ace, where he gets a Kar98k Scoped, slow speed Camo, Explosives, and high Camo detection radius (IIRC of course)
The Marksman isn't a sniper as much as a dedicated marksman in a modern army, he operates less as a loner and more as part of an attacking army, eliminating targets at further ranges, but not at super long ranges like other snipers. He also shoots faster than most snipers, but doesn't start off too good because he comes in as a recruit, not a regular.