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Warrant Officer 1 Charles bin Tangkai was enlisted into the Royal Brunei Armed Forces on 14 September 1993 and graduated recruit training on 01 April 1994. Warrant Officer 1 Charles was posted to the Joint Force Headquarters (JFHQ) holding his current post as Sergeant Major of JFHQ from 2022.

His first official appointment was at 3rd Battalion, RBLF (3Bn RBLF), Penanjong Garisson (Phase 1 - Project Team, 3Bn RBLF) during the initial establishment of the Rifle Unit. Throughout his career, he held various appointments such as 2IC Section, Section Leader, Platoon Sergeant, Company Quartermaster Sergeant, one of the Head Department of the 3Bn RBLF Quartermaster and Company Sergeant Major, D Company. He then served as Drill Sergeant Major in 2Bn RBLF, Tutong Camp and prior to his current appointment, he was the Sergeant Major of the Royal Brunei Malay Reserve Regiment.

He excelled in many of his courses including overall Best Student for Drill Instructor Course, Company Sergeant Major Course, and Warrant Officer Leadership and Management Course. During the Land Forces Company Drills Competition, he was awarded Best Company Sergeant Major in 2010.  Due to his exceptional work and outstanding dedication in the RBLF, he was presented with the Excellent Service Medal (PIKB) in 2010 and the Long Service & Good Conduct Medal (PKLPB) in 2012.

 Warrant Officer 1 Charles was born on 12 October 1975 and enjoys fishing and cycling. He is married and is blessed with two daughters and two sons.