I think you have got this just backwards. The contract described in the quotation, if there is one, is what makes what armies do more like tradecraft. (BTW I doubt that such a contract has ever existed. Appeal to a contract here, just as in Hobbes, Locke and Rousseau, is a useful fiction or myth not unlike the stories pre-scientific peoples tell to explain things like thunder.)
The armed forces of this country were unprepared to perform COIN because America "hired" its military to defend it from aggression--what the Preamble describes as "provide for the common defense." How conducting COIN in Iraq or Afghanistan provides for the common defense of the USA escapes me.
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