Combine arty and airstrike as core skills no matter the loadout. Vary specialist nades like an emp perhaps? Then again that may be better suited to covies.
I have a somewhat radical suggestion though. What if there were an RTS element to the field ops mechanic. Lets say we have a larger campaign/quick map like back in W:ET that you can glance at for greater accuracy of everythjng going on… for everbody that is. Now lets say the field ops also has a marker function that allows him to mark on everybodies map where a) the team should rally to move forward… b) where the enemy is concentrated.
That’s the RTS element. Behaving sort of like the squad sergent. Manually triggered via a binoculars style item keeping it purely FPS.
And the classic tagging of a covie in disguise wouldn’t go astray