Hello STudent

As you belong to OBC category you can apply for OBC NCL certificate from the respective authority.if your family income not exceeding rs 8 lacs per annum then you are eligible for  OBC NCL means non creamy layer certificate from the respective authority. If your father have been retired from his service in the army and getting a pension then you should be belong to to OBC NCL category as you are OBC category from the beginning.the obc-ncl certificate issuing authority sub divisional officer in a sub division of a district. In the City the issuing officer is one who is  authorised by the state government by modification.

Hope this helps.