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Colonel (U) Haji Haszahaidi bin Haji Ahmad Daud was born on 25 March 1972. He received his primary education in 1978 at a government primary school. He enlisted in the Royal Brunei Armed Forces (RBAF) in 1994. After the completion of his recruit training, he was promoted as a Cadet Officer and sent to R.A.F. Cranwell United Kingdom for Initial Officer Training. He was commissioned as Second Lieutenant on 28 July 1995 after graduating from R.A.F. Cranwell, and posted to No 3 Squadron/Flying Training School, to start his flying training.

Throughout his career, Colonel (U) Haji Haszahaidi has held various appointments starting with an Operational Helicopter Pilot in 1998, Qualified Helicopter Instructor (Q.H.I.) 2003, Flight Commander Training (F.C.T.) 2006, Flight Commander Operation (FCO) 2006, Officer Commanding No 2 Sqn Ops Wg 2006, Officer Commanding No 3 Sqn Flying Trg Wg 2019, SO2 J3A JFHQ 2011, SO1 J3A JFHQ 2012, Commanding Officer Trg Wg RBAirF 2013, Head of Inspectorate Unit RBAirF 2014, Commander Operation Group RBAirF 2018.

Throughout his service Colonel (U) Haji Haszahaidi attended various courses and studies both locally and abroad such as; Emergency Abandon the A/C in the air 1994 (RBAirF Brunei), Initial Officer Training 1995 (United Kingdom), Basic Fixed Wing Training 2006 (RBAirF Brunei), Aviation Medicine 1996 (RSAF Singapore), Helicopter Under Water Escape Trg 1997 (Megamas Brunei), Basic Flying Rotary Wing Bell 206 Jet Ranger 1998 (RBAirF Brunei), Unit Security Officer 1999 (RBAF Brunei), Methods of Instruction 2000 (SAF Singapore), BAOC/JSC 2001 (RCAF Winnipeg Canada), RBAirF BO 105 Rocket System 2002 (RBAirF Brunei), Helicopter Instructor Course 2003 (RSAF Singapore), RSAF Safety Course 2005 (RSAF Singapore), Force Protection/Anti-Terrorism & Law Enforcement CARAT Ex 2005 (US/Brunei), NEBOSH Occupational Safety & Health Year 2005 (Megamas Brunei), Combined Sea Surv', Huet Incld'g Ebs 2006 (Megamas Brunei), Aviation Physiology Training, 2006 (RSAF Singapore), RMAF Safety Course 52/2007 (RMAF Malaysia), RBAF Summary Dealing Course 1/2008 (MLU BRUNEI), Sarex Malbru Cse 09/2008 (RBAirF/RMAF Brunei), Managing Safely Institution (IOSH) 2009 (Megamas Brunei), Process Management 2009 (Megamas Brunei), OHSMS Auditor 2009 (Megamas Brunei), Superead Course 2010 (Australia), Graduate Diploma of Strategy In Defence Study and Passed Staff College (Joint) 2010 (CSC Australia), Managing Defence In The Wider Security Context Course 2011 (Defence Academy UK), RBAF C4ISR Operator Course 2011 (RBAF Brunei), National Oil Spill Cse 2011 (BSP Brunei), IMO Level 3 OSR Training 2011 (BSP Brunei), Occupational Health & Safety For Senior Management 2013 (Megamas Brunei), 11th Exe Dev Prog on Public Policy & Mge – LKY School of Public Policy National University of Singapore 2014 (SHHBIDSS Brunei), Basic Management Planning, Balance Scorecard/KRA/KRI 2015 (RBAF BRUNEI), Centre For Strategic And Policy Studies Executive Development Workshop Series In Strategic Foresight And Strategic Planning: Strategic Foresight 2017 (CSPS BRUNEI), 20th International Symposium Course 2018( ICDS National Defence University, PLA China).

Colonel (U) Haji Haszahaidi involved with various military and non-military conferences, seminars, forums and exercises at international, regional and national level such as; 3rd Workshop on ASEAN Defence Establishment and Civil Society Organisation (C.D.O.s) Cooperation on Non-Traditional Security (HADR) September 2011 Bangkok Thailand, 1st ADMM-Plus EWG on HADR Nov 2011 Beijing China, ASEAN Regional Forum Disaster Relief Exercise (A.R.F. DIREx) 2011 Manado Indonesia, 3rd Workshop ASEAN Defence Establishments and C.S.O. Cooperation on Non-Traditional Security: T.T.X. on Disaster Management Human Assistance (DMHA) year 2011 in Thailand, National Oil Spill Exercise, the Year 2011 in Brunei Darussalam, Brunei International Defence Exhibition Year 2011 (BRIDEX 2011), Brunei International Shooting Armed Meet 10 (BISAM10) Year 2012, Initial Planning Conference for the 2nd ASEAN HADR Ex (A.H.X.) and the ADMM-Plus HADR/Military Medicine Ex. August 2012 Brunei Darussalam, Final Planning Conference and Site Visit for the ADMM-Plus HADR/Military Medicine Ex. Apr 2013, ADMM Plus HADR & MM Ex 2013 in Brunei Darussalam as the Mentiri Site Commander, and National Exercise – Eksesais Perisai Kebangsaan 2014 as the head assessor for a bomb threat. He was a Co-Chairman of A.W.G. Bilateral Meeting RBAirF and RTAF Year 2018, and Co-Chair Conference and C.P.X. RBAirF and TNIAU Indonesia 2018.

By the consent of His Majesty the Sultan and Yang Di-Pertuan of Brunei Darussalam, he was promoted to Colonel on 12 July 2019. He pursues his further studies at the University of Brunei Darussalam for Master in Public Policy and Management on 1 August 2019. He then continues his second semester at the University of California, Berkeley in the United States from 1 January 2020 till 15 May 2020 and doing his final semester back at U.B.D.

Colonel (U) Haji Haszahaidi received the Most Blessed Order of Setia Negara Brunei, 4th Class (P.S.B.) in 2008, Long Service and Good Conduct Medal in 2014, The Most Honourable Order of Seri Paduka Mahkota Brunei, 3rd Class (S.M.B.) in 2016 and Golden Jubilee Medal (P.J.E.) in 2017.

Colonel (U) Haji Haszahaidi enjoys golfing, running, swimming, hiking and cycling. He is married to an Education Officer, Hajah Rosnah be Haji Matamit and blessed with three children, Hajah Dina Qistina, Haji Muhammad Danish Qawi and Dhia Qaireen.