This budget marks a major inflection point for the Department of Defense. Over the last year, Secretary Carter has shifted the weight of the defense budget to focus on five evolving challenges we face - great power competition from a resurgent Russia and a rising China, regional threats from North Korea and Iran, and the enduring need to counter terrorism - because, while the basic elements of our nation's defense strategy remain valid, today's security environment demands that DoD be flexible and innovative in response. Armed with a bipartisan budget deal that provided some critical...