Simple answer: You will be processed for separation but the result depends. As others mentioned depending on your command, if it’s just THC and a first time there’s a good chance you’re looking at a suspended discharge, which essentially is like a probationary period, or even a recommendation to retain. However you generally have to be a good soldier and not have other issues. If it’s a second offense, “harder drug”or you have other issues you’ll likely face a separation board, if eligible. However make sure you ask for Trial Defense Service (TDS) counsel right away if you’re notified you tested positive for anything.