About 25 years ago, an American intelligence officer was asked how far the Chinese could project military power. His terse answer: “About as far as their army can walk.” Today, that statement is most assuredly no longer true. China has accomplished perhaps the most remarkable expansion of military power since the US geared up for World War II. In the last 15 years it has deployed nuclear and conventional missiles that can reach US forces from the western Pacific to Washington, D.C. China’s military is also assembling a set of capabilities designed to avoid or offset traditional US advantages. This...