Defense secretary applies lessons of Iraq, Afghanistan to new Pentagon budget.
Competition for resources, ‘climate migrants,’ failed states are among top concerns.
The president’s pragmatic worldview is likely to temper military engagement overseas.
He's been critical of monetary policy and has named human rights defenders to key posts.
Defense officials say it will fill urgent gaps but Special Forces officers are skeptical.
America needs a bigger military to stabilize weak or potentially threatening nations, some analysts argue.
Reviews under way, to be ready for the next president, are intended to accelerate a new strategy.
As officials consider sending more troops to Afghanistan, some worry about the lack of a larger plan.
As the fight in Iraq drives fundamental changes to the military, it is also forcing a debate on how far those changes should go.