Conversation so far:
Who is Anna Hazare?
Kisan Baburao Hazare, known as Anna Hazare, is an Indian social activist who led movements to promote rural development, increase government transparency, and investigate and punish corruption in public life.
Did Anna Hazare win any medals for his service?
Was Anna Hazare injured in the crash during the Indo-Pakistani War?
What happened to Anna Hazare after surviving the crash during the Indo-Pakistani War in the military?
He had another escape in Nagaland, where one night, underground Naga rebels attacked his post and killed all the inmates.
What happened to Anna Hazare after the escape in Nagaland?
Official records show that he was honourably discharged in 1975 after completing 12 years of service.

Question: When did he complete his military service?
Self-contained rewrite: When did Anna Hazare complete his military service?