For all the changes in naval warfare—from non-state actors to precision-guided missiles to the inevitable small, autonomous, unmanned craft tactics—the maritime world is exactly how Alfred Thayer Mahan described it a century ago. This doesn’t mean naval tactics, and therefore naval warfare, will be the same as described in his works. That won’t be the case. Whatever character littoral naval warfare takes on in the future, its north star will always be sea control.