Here are mine

Assault

1.Predator missile

2.Strafe Run

3.Ac-130

Support

1.Counter Uav

2.Advanced Uav

3.Stealth Bomber,EMP

And with Specialist it usually depends on which gun im using and i select my 3 perks based off my 1st tier perk

I'm pretty much assault at the moment. Trying to get the 1000 kills, Got it for the predator and getting there with the other two.

Predator missile

Attack Helicopter

Pavelow

Assault:  Attack Chopper, Reaper, Juggernaunt

Support: I don't have a standard setup I use for support.  They are setup differently on each class I use them on to cater to that class

assualt i run  uav care package pred missile  or  pred missle precision air strike and attack heli

support    sam turret or auav  stealth bomber   emp jugg or escort depending  on my mood

specialist   assassin  soh  sitrep

For Assault Class, I rarely try to go for high-end killstreaks as I don't think I'm THAT good in getting that many in a row, so I tend to use Predator Missile, Precision Airstrike, and Attack Helicopter. (Quick and easy to get in good order.)

Other times, Care Package, Predator Missile, and Attack Helicopter.

Rarest times, I did try AH-6 Overwatch, Reaper, Assault Drone, Pave Low and AC-130 as my highest streaks and only managed to get the each one maybe 3-4 times I think and mostly only on luck with using an Attack Helicopter beforehand and getting several kills with it. Have never tried for the Juggernaut or Osprey Gunner though as I don't think I'd ever be able to get them unless I played against a really bad noob team, lol.

For Support, like others, I tend to switch them up a bit. At first, I did UAV, Recon Drone, and Stealth Bomber. Then when I started switching up, I tried out UAV, CUAV, and AUAV,. Another time UAV, Recon Drone, and Remote Sentry, and so on. Only did EMP once though, and haven't tried for the Juggernaut or Escort Airdrop though.

Also as mentioned, Specialist I tend to mix up depending on my other set-ups. Right now, got Sleight of Hand Pro, Quickdraw Pro, and Blind Eye Pro for my 3 and have managed to get the Specialist Bonus a few times (at least enough to get the emblem).

Run Specialist only line up depends on weapon class and in some case weapon for example

Most ARS    Extreme Cond/Stalker/Marksman

PP90/UMP  Extreme Cond/SOH/Blastshield

Mine are I.M.S/Heli and AH-6 I only play FFA you get that killstreak going its GAMEOVER!!

If I play serious.

Assault:

Attack Helicopter, Pavelow, Osprey

Support:

Advanced UAV, Stealth Bomber, EMP

specialist if im going for points, if not uav, pred , attack chopper . no point in putting on the big streaks because i never get them. support counter uav , turret or b/v, advanced uav .