Q: Will I have to retire from my federal job with Customs and Border Patrol with a medical retirement from the National Guard? I was called up for military duty. I bought back eight years of military service and have seven years with CBP for a total of 15 years. A: As a rule, medical retirement from the National Guard would have no bearing on your employment by the Customs and Border Patrol. It would only affect that employment if your medical condition were such that it made you unable to provide useful and efficient service there.