The Defense Department's modernization plans will be driven by the potential for conflict with China and Russia, with some priorities expected to overlap, while others will likely compete, according to DOD's second-highest-ranking officer. Gen. Paul Selva, vice chairman of the Joint Chiefs of Staff, said this week the "primary difference" between previous strategies and the new National Defense Strategy unveiled last month is how the U.S. military will organize itself to engage in great power competition with China and Russia...