We're really sorry to see you go, but I totally understand how school can be. We'll take care of disabling the keycard, for now just go ahead and keep it in a safe place - If you have time to re-join in the future we would be more than happy to have you use the same one or issue you a new one. Either way. If you have any time to collaborate or work on small projects, we'd still be more than happy to have you around. Let me know if you ever have time to drop by and say hello again. Good luck with your endeavors!