5th Skill for an E75 / E100 crew?

So I've just finished training the 4th skill, and since this big boy has a dedicated radioman, I don't need situational awareness on my commander, so I was wondering, what should I pick next?

The crew currently is:

Commander: BIA, 6th Sense, Repairs, Recon

Gunner: BIA, Repairs, Snap Shot, Deadeye

Driver: BIA, Repairs, Smooth Ride, Off Road

Radio: BIA, Repairs, Situational, Firefighting

Loader: BIA, Repairs, Safe Stowage, Adrenaline Rush, Intuition (85%)

Yeah the crew was already half trained from before the intuition change and I didn't want to retrain the loader so I gave her an 850k exp book.

So I don't know what to choose for:

Commander: Firefighting? Sound Detection? Jack of All Trades? Eagle Eye?

Gunner: Firefighting? Designated Target? Armorer?

Driver: I'll probably go with clutch breaking with this one, but idk if firefighting would be better, I'm too slow for controlled impact, at least I know that, and preventative maintenance? idk.

Radio: Call for Vengeance, Signal boosting, Relaying??