If a similar and equally large-scale attack was done by a nation at war with US, targeting US military command, would that be a low-casualty operation or an act of terrorism?

And would it matter if the technical interpretation differed wildly from the general perception?

For what it's worth, I consider both parties in their forever war to be irredeemable bastards. As I learned early on, the network of tunnels in Gaza has no civilian shelter space, a clear indication that their general population's safety has not been a concern. On the upside, if there is any to be found, at least it means there won't be human shields to speak of down there.

That said, I don't know if that would make a difference. Both sides have demonstrated that they are perfectly happy to slaughter civilians.