In an important speech delivered Monday in London, the British Defense Minister John Reid suggested that we consider revising the Geneva Conventions regarding conduct in war. He wants to accommodate the altered reality of modern terrorism. "I believe we need now to consider whether we--the international community in its widest sense--need to re-examine these conventions," Mr. Reid said. "If we do not, we risk continuing to fight a 21st-century conflict with 20th-century rules." The Geneva Conventions were shaped 50 years ago, Mr. Reid said, but "warfare continues to evolve, and, in its moral dimensions, we have now to cope with a deliberate regression towards barbaric terrorism by our opponents."