MERC Snipers are marksmen wearing orange and gray caps and masks. True to their name, they are long-ranged fighters, preferring to set up camp and engage from far away. They can be difficult to approach as they have a long engagement distance, have weak tac bars, and frantically dodge the player up close. Snipers will occasionally zero in on their target with a visible sniper reticle on the UI, and fire a shot that ignores tac-bar and has to be physically dodged.
this is from the wiki