If you are a veteran you may be entitled to additional benefits.

Veterans Service Buyback

If you are a veteran, you may be entitled to purchase creditable service for military service either before you became a public employee or while on leave from public service. See our retirement guide for additional information. You would need to file a Veterans' Buyback Form  pdf format of Veterans' Buyback Form
with your local retirement board. 

Additional Retirement Benefit for Veterans

If you are a veteran, as defined in section one of Chapter 32, you will receive $15 a year extra for every year or fraction thereof of creditable service, up to a maximum additional benefit of $300 a year. You would need to supply your retirement system with a copy of your DD 214 form.