I have zero proof, just a suspicion.
- The most likely culprit of sophisticated man-made crop circles, getting the patterns so precise, is from an aerial device using infra-red beams or whatever. The crop circles are just tests.
- Enough crop circles with cheeky, knowing designs have occurred for us to know that they are designed by people, and they are into esoteric stuff, even just for fun.
- National Reconnaissance Office has fun with its logos, and they are very good at sky tech. Satellites etc.
It was speculated on Twitter that this logo points to a weird Earth anomaly sometimes thought to be an Atlantis candidate:
The NRO clearly likes having fun with logos and mission patches (see some here), this is probably a nod to Lovercraft: