[silisili]

Based on this and several other of your responses below, would you say that it's fair to conclude that it's been a term for a long time, perhaps more in military/defense circles, but recently has gotten more mainstream media use?

I find it otherwise peculiar some feel like it appeared out of thin air, while others feel like it's always been a thing.

[grosswait]

In my experience, yes, has always been a thing.