As the newest administration in Washington hammers out a strategy for the war in Afghanistan, a rift has opened among U.S. policymakers about how to proceed. On one side is the Pentagon, which has proposed sending up to 3,900 troops to the conflict-ridden country. If approved, the move would escalate the United States' involvement in the war, which began over 15 years ago. On the other side of the debate is the White House, where reports have emerged of calls to draw down the U.S. troop presence in Afghanistan. War fatigue, spurred by an unwillingness to wade deeper into a feud whose resolution eluded the administrations of Presidents George W. Bush and Barack Obama, is clearly setting in....