The abrupt resignation of former Central Intelligence Agency Director David H. Petraeus after an extramarital affair came to light, together with expected high-level personnel changes at the State Department and other agencies, create a singular opportunity to embark on the complex process of rebalancing U.S. foreign policy in favor of non-military approaches. Above, from left to right: President Obama, Secretary of Defense Leon Panetta, Petraeus and General John Allen in 2011.