Aren't we the supporting country?
That might work in some circumstances, if the country we're supporting has a functional army and the terrain is suitable. There will also be many circumstances in which it will not work, notably those in which the "country" we're supporting has no army, or if we've chosen to disband that army.
The US, it seems to me, has a uniquely persistent habit of entering what might be called "large small wars": conflicts that may be fought on a "small wars" model, but with a scope, duration, and expenditure that are anything but small. Creating a government, building a nation, installing a democracy are not small endeavors. If we adopt goals that require us to do these things, we are moving into a large small war, and that's troublesome territory. In a large small war attrition and political will become major factors, and public tolerance will be limited.
One overlooked lesson, if it was ever learned in the first place, would be to keep small wars small, and to resist the temptation to pursue objectives that push the scale out of hand.
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