His staff officer positions were Base Commander in 2010, Defence Advisor of Brunei Darussalam to Malaysia from 2012 to 2013, Military Assistant to Commander Royal Brunei Armed Forces (RBAF) from 2007 to 2009, and Head of Capability Development Cell in 2015.

[3] Together with New Zealand, Othman served as co-chairman of the ADMM-Plus Expert Working Group (EWG) on maritime security from 2015 to 2017.

In 2016, RBN had the honor of hosting the Field Training Exercise on Maritime Security and Counter Terrorism while he served as chairman.

Admiral Nikolai Yevmenov, the commander-in-chief of the Russian Navy, was visited by Dato Othman.

Beng also joined Dato Othman in attending a United States Navy Pacific Fleet virtual leadership engagement program.