The Middle East is just a blip. The American military contest with China in the Pacific will define the twenty-first century. And China will be a more formidable adversary than Russia ever was For some time now no navy or air force has posed a threat to the United States. Our only competition has been armies, whether conventional forces or guerrilla insurgencies. This will soon change. The Chinese navy is poised to push out into the Pacific—and when it does, it will very quickly encounter a U.S. Navy and Air Force unwilling to budge from the coastal shelf of the...