Umm, maybe not:

"..Developing diabetes while already serving in the military, however, is not automatic grounds for separation (retirement) from the military. Several hundred service members (out of more than 1.4 million currently serving) are diagnosed with diabetes each year. Between 1997 and 2007, fewer than 6% of diabetes diagnoses were Type 1 diabetes, 80% were Type 2 diabetes, and the remaining 14% were not consistently reported as either Type 1 or Type 2 diabetes. .."

https://www.diabetesselfmanagement.com/about-diabetes/general-diabetes-information/diabetes-in-the-military/