I've got your back on this anon… because I live south of Indy, and I've had military choppers fly over here on almost a daily basis for the past week. Unusual as fuck…even with Atterbury in the vicinity. They've flown so low at times that the house shook.
Sounds like I'm not even as close to Atterbury as you are, but the first chopper I noticed flying over…I immediately came inside to hit up the ADS-B site to see if it'd show up…and it came up with the EVILI44 callsign. Every day for a week, there'd be at least one that'd flyover, if not more. Yesterday & Today are the only 2 days since it started, that none flew over my place.