President Barack Obama speaks about the resignation of Gen. Stanley A. McChrystal, the commander of U.S. troops in Afghanistan, at the White House as Gen. David H. Petraeus listens. Mr. Obama said Gen. Petraeus, previously the commander of U.S. forces in the Middle East and Central Asia, will replace Gen. McChrystal. (Bloomberg)

Photo by: Chris Kleponis

President Barack Obama speaks about the resignation of Gen. Stanley A. McChrystal, the commander of U.S. troops in Afghanistan, at the White House as Gen. David H. Petraeus listens. Mr. Obama said Gen. Petraeus, previously the commander of U.S. forces in the Middle East and Central Asia, will replace Gen. McChrystal. (Bloomberg)