His comment isn't wholly unjustified. If you take a photograph of helicopters in a military base, it is plausible (possibly even likely) that someone familiar w

His comment isn't wholly unjustified. If you take a photograph of helicopters in a military base, it is plausible (possibly even likely) that someone familiar with the area could figure out their location purely by looking at the photo - based on the background content of the photograph. The point you could make is that if you're worried about people figuring out where you are, you probably shouldn't publish photos of your location on the internet.