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700 Lieutenant Colonel (U) Mohammad Khairul bin Pehin Datu Indera Setia Dato Paduka Seri Haji Sulaiman enlisted in the Royal Brunei Armed Forces (RBAF) on 11th March 2002. He was later commissioned as an officer on 4th February 2004 after completing his Initial Officer Course in RAF Cranwell, United Kingdom.

In 2004 to 2006, he began his career in Operational Wing as an Administration Officer.  He then moved to Training Wing (now known as No. 7 Wing) as Officer Under Training from 2006 until 2008. He was promoted to a rank Captain in 2008 and posted as Intelligence Officer in the Air Regiment (currently known as No. 2 Wing) in 2008 to 2011.

In the following years, his career has been focused on military training and education where he was posted to Headquarters Training Institute RBAF as Assistant Chief Instructor until 2013 and then transferred to Defence Academy RBAF as Directing Staff I until 2016. He was promoted to a rank Major in 2013.

In 2016 to 2018 he became 75 Squadron, Squadron Commander in No. 7 Wing RBAirF. He then became the Second in Command (2IC), No. 7 Wing and Staff Officer Grade 2 Training, Headquarters RBAirF in 2018. November 2019, he became the Wing Commander for No. 7 Wing. He was honored with Pingat Indah Kerja Baik (PIKB) in 2017. In November 2020 he was promoted to the rank of Lieutenant Colonel. In Jan 2023 he held the appointment of Head of Staff at the Command and Staff College, Defence Academy RBAF. Currently he holds the appointment of Chief Instructor, Defence Academy RBAF.

Lieutenant Colonel (U) Mohammad Khairul is married to Dk Masni binti Pg Haji Sabtu and are blessed with four children. His interest includes golf and running.​

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