These are not snipers lah. Kevlar helmet, no ghilly suit, these are infantry soldiers. 2nd and 3rd pic shows m16 carbine. A sniper would be using a scope. White lens is a definite no-no, not even camoflaged, that's unprofessional.
whether a sniper uses a ghillie suite or not depends on the mission. most snipers wear jungle cap instead of a helmet instead. a sniper/his spotter carries a carbine for defensive purposes should an enemy appear in close vicinity and spots them. also, it is possible to mount a scope on a M16/M4 FYI.