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Lieutenant General Thomas Oppong-Peprah was commissioned into the Ghana Armed Forces in 1986 as part of Regular Career Course 26 and was posted to the Armoured Reconnaissance Regiment as a Second Lieutenant.

His civil educational qualifications include a Master of Arts in International Security and Strategy from Kings College, London (2013 – 2014) and an Executive Master of Business Administration (Human Resource Management) from University of Ghana, Legon (2006 – 2007). He also holds a Bachelor of Science Degree in Business Administration (Human Resource Management) from the University of Ghana (1999 – 2004) and a Post-Graduate Certificate in Public Administration from Ghana Institute of Management and Public Administration (1998).
Lieutenant General Oppong-Peprah has undertaken several career progression courses. These include the Combined/Joint Forces Land Component Commanders Course at USA Army War College, Carlisle, Pennsylvania (April 2021), Defence Studies at the Royal College of Defence Studies, London, United Kingdom (2013 – 2014),

Senior Intelligence Course at the Joint Intelligence Centre, Strasbourg, France (2010),

Law of Combating Terrorism at the Defence Institute of International Legal Studies, Newport, Rhode Island, USA (2009), and Senior Command and Staff Course at the US Army Command and General Staff College, Fort Leavenworth, Kansas, USA (2000-2001).

Other career progression courses undertaken are Senior Command and Staff Course at Ghana Armed Forces Command and Staff College, Accra (1998 – 1999), Junior Command and Staff Course at the Command and Staff College, Kaduna, Nigeria (1997), and Armour Officer Basic Course at the US Army Armour School, Fort Knox, Kentucky, USA (1996).

Appointments held in the course of his career include Aide-de-Camp to the Chief of the Army Staff and Chief of the Defence Staff, Ghana Armed Forces (1995 – 1997), and Operations/Training Officer, 64 Infantry Regiment, (1999 – 2000). He became the Commanding Officer, 64 Infantry Regiment from 2002 to 2009, with additional appointments as Commanding Officer, Armoured Reconnaissance Regiment, (2004-2005). He was also the Coordinator of State Transport Security (2001 – 2008) and Instructor, Disaster Management Course, Army Combat Training School, Teshie (2001-2005).

Other appointments held are Director, Strategic Intelligence at the Defence Intelligence Department, General Headquarters (2009-2011) and Director Operations and Plans, Defence Industries Department, General Headquarters (2011 – 2013). He also held the appointment of Director Army Training and Director Army Peacekeeping Operations at the Army Headquarters in Sep 14 to Feb 16 and Feb – Jul 16, respectively. He assumed the office of Chief Staff Officer at the same headquarters from Jul 16 –Feb 17.

Prior to his appointment as the Chief of Staff at the General Headquarters, he was the General Officer Commanding, Southern Command of the Ghana Army (Feb 17 – Jan 19). He was subsequently appointed the Chief of the Army Staff March 2020 and held this appointment until 31 January 2024.

Lieutenant General Thomas Oppong-Peprah was appointed the Chief of the Defence Staff of the Ghana Armed Forces on 1 February 2024, a position he currently holds.

In International Peacekeeping Operations, Lieutenant General Oppong-Peprah served as Humanitarian Officer, United Nations Assistance Mission in Rwanda (June-December 1994), Military Observer, United Nations Aouzou Strip Observer Group in Libya/Chad (March – May 1994), G4 Transport and Plans, United Nations Mission for the Referendum in Western Sahara (1993) and Detachment Second-In-Command/Troop Leader, United Nations Interim Force in Lebanon/Israel (1987, 1989, 1992).

He is a board member of the Governing Council of the National Disaster Management Organisation (NADMO).

Lieutenant General Thomas Oppong-Peprah is married with five children. He enjoys horse riding, soccer, travelling, watching movies and jogging.