He says something like only Operatives can see them, so Operatives may the only ones who can remove them.
If i saw myself running around, and I think i'd recognize me, i'm gana just start shooting. Screw the questions, more bullets please...
As far as playing an operative. My goal in Brink will be to cause as much disruption, confusion and deception as possible. I'll likely wield a scoped SMG and a Revolver, with whatever aiming device i can slap on it (if any).
I want to kill people, creatively! I wana see that heavy soldier go "oh hey, its that medic!" and ignore me while i run up to "heal" him with my knife and revolver, then have the challenge of trying to get away alive once my disguise drops, and the devious thrill if i succeed... If i wanted to be a more effective combatant, i'd choose a soldier of forms. Really though, if operatives dont have enough trickery up their sleeves, I'll probably loose interest. I've always chosen to fight with cunning rather then actual brute force.
In nearly every game i've played before, i generally wont engage some one head on, but rather bait them into a more predictable situation, such as dragging them around a corner, or up some stairs, or anything where I'll generally know where they'll be when.
Other then slaying people unexpectedly, I'll be doing whatever i can to cause disruption, hacking turrets, control points, getting that comm data whenever i can. I plan to play an operative fully, since i like how they work.
Other then that, if i want to destroy things and people, i'll play a Soldier. This is likely going to be my sub spec for my character.
If i want to be useful, i'll play a medic.
If i want a change of pace, i'll play an engineer.