I predict, not one single solitary thing will be done about it. I wish I could be more positive, but I can't.
Dept of State is runnng these folks or are they spies? The question answers itself. Still, this story does not make sense. The US has the technology to analyze this attack on our personnel. So obviously it is known what is causing it. Therefore, what information is missing from what we are being told? If Trump is aware of it as well as Tillerson, would they both passively leave employees at risk of permanent brain damage or hearing loss? Trump the businessman wouldn’t.
I suspect you are correct but....... what could be done?
About the only course would be to withdraw.