Send JSOC to train and conduct multiple targeted raids every night, disrupt their streams of income and combat their propaganda via cyber warfare. Use local trained forces to conduct large ground attacks and have JSOC send units to accompany them and call in air units.
Raise security in major cities and increase surveillance gathering on people to stop future events and plans.
Raid all domestic high risk individuals like they are doing in Paris and question them.
There is so much more we could be doing, but conducting conventional war just doesn't work anymore - plus it's just a political nightmare.”