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First Admiral Dato Seri Pahlawan Abdul Aziz bin Haji Mohd Tamit was born on 23 September 1966. He joined the Royal Brunei Armed Forces in January 1984 and graduated as midshipman in 1985 from Britannia Royal Naval College in United Kingdom. He was promoted to the rank of Lieutenant in 1986 and to Captain in 1990. He was promoted to Major in 1994 and to Lieutenant Colonel in 2002.  

In 2006 he was promoted to Colonel and five years later he was promoted to First Admiral.

During his service, he held numerous staff and command appointments such as Gunnery Officer, Navigation Officer and Executive Officer of Missile Gunboats and Coastal Patrol Crafts.  Ships commanded by him included KDB PERWIRA, KDB PEJUANG and KDB WASPADA.  He had the privilege to command Royal Brunei Navy Fleet twice from 09 March 2003 to 22 December 2005 and 29 June 2006 to 01 April 2007. The First Admiral has held various important staff appointments include SO3 Doctrine & Staff Duties in Directorate of Training, Head of Naval Project in Directorate of Operations in 2007, Head of Special Project in Deputy Minister of Defence Secretariat, Director of Force Capability Development and Director of Operations on 14th November 2007.  First Admiral Abdul Aziz was appointed as Joint Force Commander on 23 November 2009 and he was appointed as Commander of Royal Brunei Navy on 28 February 2014, a post which he held until 13 March 2015 and assuming his current appointment as Deputy Commander of Royal Brunei Armed Forces on 13 March 2015.

Throughout his career, he has undergone various courses locally and abroad such as International Sub Lieutenant, International Communication and Electronic Warfare, International Principal Warfare Officer Courses in United Kingdom.  He successfully completed Naval Junior Staff Course in Australia and attended Naval Staff Course in Naval War College USA in 1999 and further attended National Security Staff Course in Canada Forces College in 2006.  He also attended Executive Development Programme in University Brunei Darussalam in 2002 and Negotiation Programme in Said Business School, University of Oxford in 2007.  In 2013 he attended Senior Executives in National and International Security at Harvard Kennedy School.

First Admiral Abdul Aziz was awarded the Most Honourable Order of the Crown of Brunei (S.M.B. – 3rd Class) on 15 July 2006. On the 15 July 2011 His Majesty bestowed the Darjah Pahlawan Negara Brunei Yang Amat Perkasa (The Most Gallant Order of Pahlawan Negara Brunei) First Class (PSPNB) with the title 'Dato Seri Pahlawan' to First Admiral Abdul Aziz.​

He is married to Datin Sakdiah binte Haji Mohd Noor and blessed with three boys. He loves golfing and reading.