Someone actually did it to China's PLA Unit 61398 using a technique similar to this: http://www.gizmag.com/microphone-room-mapping-epfl/27985/ http://www.gizmag

Someone actually did it to China's PLA Unit 61398 using a technique similar to this: http://www.gizmag.com/microphone-room-mapping-epfl/27985/ http://www.gizmag.com/microphone-room-mapping-epfl/27985/, so I'd say it's worth worrying about in the wild.