A tremendous victory — and a new chapter. Today in Rome, the Coalition to Defeat ISIS marks the achievement of Operation Inherent Resolve (OIR), one of the great military campaigns of our time: the territorial caliphate dismantled, and a path opened from terror toward stability. That victory belongs to the Americans and coalition partners who served, and to the Iraqis and Syrians who fought for their nations' futures. It belongs most of all to those who did not come home, and to the Gold Star families who carry their absence every day. No ceremony can repay that debt. What we can do is make certain their sacrifice purchased something lasting — a region where the caliphate cannot return, and nations able to defend what their sons and daughters helped secure. That is the measure by which this mission must be judged, and the promise we owe them. President Trump understands that victory requires both the strength to prevail and the confidence to hand the region its own future once the mission is accomplished. OIR was an instrument of stability; its success is measured by how much responsibility our partners can now carry themselves.