If you're referring to the "people who physically killed them" as the individual(s) who operated the drone(s), I imagine they are the ones who need the most (mental) help, after learning their superiors provided faulty intelligence and allegedly killed innocent people.[0]

The two(+) that are perhaps the most relevant are those that provided the intelligence (framing), and those that made the decision to act on it.

[0] I don't know how much liberty drone operators have to make live decisions in the .. "field" about whether to engage or not, but I suspect this case involved some level of abstraction.

Okay? Who is that? Who specifically? The drone pilot?

With a missile strike, who would that be?

At least the party who ordered the missile strike. The Navy servicemen mainly launch the missiles to coordinates X, Y without questioning the order, so they're an accessory to murder.

https://en.m.wikipedia.org/wiki/Accessory_(legal_term)

I don't necessarily disagree, but how would they have effectively questioned that order? If they asked for confirmation for who they were striking, they would have received the US's faulty intel. And it's not like they had any power to independently verify it.

If there were a massive amount of charges filed for everyone involved with the strike, I'd agree that the servicemen should also be charged. I'm not sure that's where we should start, as I feel it's too likely that's also where we would end and they are the least responsible of the related parties.

They don't have any choice but to follow orders once they're part of a military org. That's why the parties ordering the strike should carry most of the responsibility.

no wrong... you can not commit war crimes and use that as a excuse why you did it, following orders is what the Nazis tried to uses as a excuse... if you see you are bombing a hospital,a school,open market or first responders and you still bomb them then you and the people ordering it are responsible.

True, but I was arguing the missile operators only get the order with the coordinates and may not know what the target is or may get misleading intel, like the drone operator who was told that their target were ISIS operatives when in reality they were aid workers associated with the US. The nazis knowingky took people to the concentration camps and executed them.