Bullets and bombs killed nearly three-quarters of a million people in wars between 2021 and 2024. Many more died from the indirect effects of conflict, such as hunger and disease. Combat deaths in the past four years have been the highest since the end of the cold war. And for what purpose? Not even the leaders who started recent wars can be pleased with the results. Russia’s invasion of Ukraine has become a humiliating quagmire for Vladimir Putin. President Donald Trump’s war on Iran has gone badly awry . These two wars of choice exemplify two new battlefield truths. Technology has made it harder for any army to advance on the ground.…