Stealth is Islamic State's weapon against coalition's sophisticated tactics
In areas the Islamic State group seized more than two years ago, houses have been tagged with graffiti symbols to indicate if the owner was Christian or Shiite or to claim the property for the Sunni extremist group. But in the al-Dandan neighborhood of Mosul, a red circle spray-painted near the front gate means the covered driveway could be used to hide a car bomb from overhead observation.