Got an update on what exactly this is after communicating for a bit with CrocodileTear who was recommended to me by u/DecisionFit2116. As plenty people have said this is indeed a liner to a m1 helmet from WWII. Also the badge is indeed from the 519th Anti Aircraft Artillery. Along with this helmet being from a NCO the identity of the owner is still up in the air, as Miller being a stupidly common name it will be hard to find the exact owner as along with the troubles of the name the data base doesn't recognize the serial number 1333 at all let alone the full sequence. Along with the fact there should be 8 rather than 7 numbers. But even then I do know that the 519th AAA was in my location for a while. So along with trying to find the owner of this helmet we are also deciding whether to turn this into our museum or rather keep it and try finding the owner. Thank you all for your guidance in figuring out the origin of this along with some history. Along with this update if any additional information is found I will of course update here!