The divsion has a wide variety of permanent & attached reconissance units.  There is a sniper section in the divsion HQ/support group somewhere, but it would be not the same thing as the battalion STA. 

I never worried much about the finer points of TO/TE since a TO unit hardly ever came in sight.  One works with what you have when you have it and constantly shout for more. 

i'm just a little confused please bare with me, so the marines in the sta  platoon are recon guys or scout snipers and what makes them different...

Both.  When I was a a S2 we used them as sniper teams, or scout teams, or sometimes both.  The STA team members I had were mostly school trained snipers.  Only one had been trained in a Recon battalion.  The reconissance training for the others derived from their other infantry training, or what the plt sgt taught them.  The Combat Readiness Evaluation Standards (similar to the US Army ARTEP of the old days) had a few tasks and eval standards for the STA paltoon that concerned reconissance, so that sort of set a minimum goal.

In one exercise I had the STA teams divided into four OP teams & sitting on some remote hill tops.  In another they were in sniper hides around a Korean airport.  On a third they were distributed to the rifle companys for the company comanders use.