"When a new fleet of helicopters arrived with an aviation unit at a base in Iraq, some Soldiers took pictures on the flightline, he said. From the photos that were uploaded to the Internet, the enemy was able to determine the exact location of the helicopters inside the compound and conduct a mortar attack, destroying four of the AH-64 Apaches."

I'm not sure that geotagging is the real problem here. A picture of a new helicopter or of the inside of a military base in a war zone is sensitive operational information that should not be posted to the internet, whether it's geotagged or not. Enemy intelligence services could probably piece together lots of valuable information from dozens of seemingly innocuous photos.

For example, even if the enemy couldn't blow up those helicopters, just knowing the number of helicopters available at that base, or that the base had received additional helicopters, could be an advantage in planning an attack.