After six months of war in Ukraine, some observers have insisted that “we are seeing the very nature of combat change” and that tanks, along with fighter jets and warships, “are being pushed into obsolescence.” But it is too soon to write off the tank, and we should resist jumping to other sweeping conclusions about the future of warfare based on a conflict whose lessons are not yet clear. There is still much about this war that is not known from open sources, and there is good reason to think that the conditions that marked its early phases will not...