Gen. Clark's claims and Other Countries' war plans

This is not a debate.

In another discussion regarding Gen. Clark claiming that the US has invasion plans for 7 other middle eastern countries, someone mentioned that they wouldn’t be suprised if the US has plans for invasion of any and all countries, in case that particular emergency arose.

I’m wondering if other countries’ militaries have similar plans drawn up, and if this is a common thing for governments to do.