This will continue to be the case for the foreseeable decades as the United States fights wars that are so far not yet even imagined. If these wars have been fought (as many have suggested) over the presence of the scarce resource of oil, the next wars may be fought over the even more precious resource of water.

Looking not too far into the future, the next wars may be fought over the consequences (the magnitude of which has not been determined) of climate change. As the surface of the world itself changes with rising seawater and increasing disastrous floods, hurricanes, and droughts, the nature of war is likely to change ever more dramatically and ever more quickly. Petraeus has proven to be the kind of military leader who can understand that strength is based on intelligence and flexibility, not a clinging to traditions and -- most importantly -- the...
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