August 13, 2023 16:27 Updated Follow Members of many of our funds can buy prior military service credit. Please call us at (888) 286-3544 for details. Related articles Do I have to have prior military service to be a member of the IGR? I was a substitute teacher. How can I add this service to my account? What do I need to do to add the veteran indicator on my license? Where can I buy an annual pass to state parks and reservoirs? How much does service credit cost?