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WO1 (U) Jupferi Bin Gubil was enlisted into the Royal Brunei Armed Forces on 12 October 1992. He graduated recruit training on 25 April 1993, 6 months after his date of enlistment. 

His first official post was as Platoon Radio Operator 24 in Company ‘H’ of Second Batallion, Royal Brunei Land Force. After 4 years WO1 (U) Jupferi was posted to the Air Defence Squadron with the 33 Squadron, Air Regiment.

In 1998, he was promoted to the rank Lance Corporal and held the post of Rapier Operator. Soon after, WO1 (U) Jupferi was promoted to the rank Corporal and was posted as Assistant Head Detachment, Air Regiment. In 2002, he was promoted to Sergeant and held the post of Head Detachment, Air Regiment.

From 2003 until 2005, he was posted to ‘R’ company, Training Institute Royal Brunei Armed Forces (TI RBAF) as Platoon Sergeant for which he was awarded as Best Platoon Sergeant for Recruit Intake 127. He was also won first place for Recruit Intake 129 during Platoon Parade Competition.

WO1 (U) Jupferi returned to his unit with the Air Regiment after serving in ‘R’ Company, TI RBAF, and was promoted to the rank Staff Sergeant. He then held the post of Assistant Operations Officer for 3 years. At the end of the 3 years, he was posted to the Joint Operations Centre as Supervisor of J3 Air Cell. He was promoted to Warrant Officer 1 on July 2014.

In 2016, WO1 (U) Jupferi was posted to the Joint Force Headquarters (JFHQ) holding his current post as Sergeant Major of JFHQ.

WO1 (U) Jupferi is married and has 4 children.