Defence Research and Development Organization DRDO chief Dr S Christopher has said, the Agni-V missile test today is the first user trial by the Defence Forces. <br/><br/>Addressing the media in Chennai today, he said the DRDO has completed all the three tests from its side already. <br/><br/>On the Arjun tanks developed by the DRDO, he said talks are at an advanced stage for the induction of two more regiments of the Main Battle Tank's Mark-Two version in the Army. <br/><br/>