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In India the Additional Director General of Police (ADG) is an IPS officer having a three-star rank. Though having the maximum possible 3-star police rank just like Director General of Police, Additional DGP's are considered junior to DGP's. The equivalent position or designation are Commissioner of Police of some cities like Kolkata , Chennai and Vijayawada, special or additional secretary. The rank insignia of an ADG is the national emblem over a crossed sword and baton.
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Additional Director General of Police Wikipedia(Text) CC BY-SA