President Obama unveiled the Pentagon’s new defense strategy last week, calling it a moment to “turn the page” on the past decade of wars in Iraq and Afghanistan. The new strategy places a greater emphasis on Asia and reduces ground forces in favor of air and sea forces. It accepts greater risks in some areas — most notably in abandoning the policy that the United States must be able to fight two major, protracted ground wars at once. The Pentagon argues that a two-war construct does not do justice to the complexity of the current threat environment. It has to be able to adapt to a wide, complex array of global threats rather than prepare for an arbitrary number of simultaneous wars.