Isn't airspace around all military installations exempted from this? How would you train your people to use your drones otherwise?

What's more, the feds are clearly signalling that these are ours. As others point out, you can't say its not an adversaries asset unless you know whose it is. Which would suggest either they are flying these illegally, they have some kind of exemption to fly in civilian air space, or they are being flown in military air space that is observable from non-military locations.