Threat Tracer
Jammer
Tracker
Blind spot
Loadout Pro
Deflection haha
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>.> Only non useful perk is Jammer, its only useful if you want to get your team fired upon. Basically it fills the role that blindspot does, just poorly. The poor thing is that it means that your entire team will be fired upon if you are in a group of people because you perfectly give away your position, you can use the radius to find where people are. Only useful spot is maybe car park in the stair way.
laser + no stealth + jammer is useful if you want people to find you
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Covert Ops is awesome for good players, if you don't know why, your sound card or headphones aren't good enough. Stealth tracker same reason.
Tracker level 3 is good when theres a low number of players.
If deflection was a perk I could wear, I would put it on. I don't get it enough to know if it helps me, but it does seem to help against certain weapons, shotguns, sniper rifles and jaws (lol).
Load out pro is great for certain styles.