While studying for my part 107 test last year, I purchased the FAA maps that detail areas nearest my residence. A farmers field next door is a great place to practice - anyway I noticed that there is a military route at 300’ for hi-speed helicopters. My neighbor and I have seen, on several occasions an unusual night time flight formation of at least 4 maybe 6 drones. I fly there often and know the alt and speed are drone. Grabbed my binoculars to see what they looked like. I swear I saw fixed wing. Also the noise that they made wasn’t what I expected- almost jet-engine sounding tho not fast. They went around in about mile size circles before buzzing off. Is this crazy? They generally followed the milroute and I’m in a general area near an airbase. What drone sounds like a jet?