A new reserve group, inspired by the Monuments Men of the World War II era, will aim to protect antiquities and important cultural sites in war zones. It’s no secret that the war-ravaged nations where American soldiers have been enmeshed in conflict for nearly two decades are home to many of civilization’s oldest and most prized antiquities and cultural treasures. But in the heat of battle in Afghanistan or Iraq, how are troops to know whether they are taking their positions behind mounds of insignificant rubble or inside the precious remains of a 3,000-year-old temple complex? The Pentagon’s answer, announced...