[Mulder]

There are not enough people in the US to protect all 'vulnerable' bits, let alone police/military personel

That will be part of the pretense for bringing in the foreign troops.

[Saturn_V]

I doubt it. There are not many countries which have the resources (money/manpower/material) to stage a long-range deployment in anything like significant numbers, let alone significant time frames. Include the possibility of hostile reaction of the natives, the lack of political will (on the part of the foreign governments), and the fact that an event that would trigger such a deployment would also demonstrate fairly conclusively that such a deployment would be ineffectual, and I see no circumstance under which your prediction could be realized...

-SV