It doesn't involve capture of territory or even destruction of equipment. These enemies will not surrender because of that. Victory involves killing enough of these non-surrendering enemies that they lose the desire and/or capacity to maintain their attacks on US citizens.
Given that, any thoughts on updating the old war treaties? Even the Nazis and Imperial Japan surrendered when it was obvious they could not win because they lost too much territory or the ability to defend sufficiently. So, the old models applied to conflict against even those evil regimes. But islamists won't surrender no matter how bad things get for them, so they need to be killed if victory is desired. Cartels are similar in this regard.
Offered for discussion. Feel free to criticize.
((And, I suppose feel free to be so emotionally outraged that you forego intelligent discussion...this latter approach seems common, even though it doesn't solve problems.))
We executed Japanese naval officers for this crime