First, I'm assuming there is actually a reason to limit the public's wandering through military bases. If that's the case, ISTM that safety only requires the pu

First, I'm assuming there is actually a reason to limit the public's wandering through military bases. If that's the case, ISTM that safety only requires the public stay out of probably-already-fenced actually-dangerous areas. Keeping the public out of all lands must be for some less tangible reason like "national security". People can walk on unfenced land whether or not they have an AR app. If it's important that they not walk there, put up some signs or increase patrols or whatever. Those are local solutions that aren't easily aggregated by a single app developer seeking all locations with "national security" connections. Airspace may be restricted for any number of reasons, especially safety. Also, we can't build fences in the air. So, airspace restriction for reasons of "national security" can hide among all the other airspace restrictions. On the ground, that isn't the case.