The first step would be to contact USCIS and inquire as to the forms that you would need to file.https://www.uscis.gov/military/naturalization-through-military-serviceI would also investigate whether you were covered under the Lodge Act as that allowed non citizens to file after they had served in the military. The Act was cancelled some time ago but there may be some sort of retroactive program still in existence.You will need your DD214. If you donu2019t have one hereu2019s where you go to get one:Getting a Copy of Your DD Form 214 from the National ArchivesElectronic method. Use the eVetRecs system to create your request.Paper method. Mail or Fax a Standard Form SF-180. Print, sign, and date all copies of paper forms before submitting them. The address is listed at the end of the SF 180.Good luck, welcome home brother.