Most plausible theory I have heard yet. [1] disclaimer: prepper channel, some here may perceive it as nutty. Nuke sensors would explain why the guard is not touching them.
As a follow up, it's being communicated that we knew about these drones for 6 years. Not sure I buy it. They have been showing up in multiple states, not just the army post that had the TFR. Or it's mass hysteria.
[1] - https://www.youtube.com/watch?v=PaEPvrq5VFM [video][21 mins]