General Sir Mark Carleton-Smith was commissioned into 1st Battalion Irish Guards from the Royal Military Academy Sandhurst in 1986 and served at regimental duty in London, Germany, Canada and South Armagh, prior to service in The Gulf and The Balkans.
A graduate of the final Army Command and Staff Course at Camberley, he was appointed Chief of Staff 19 Mechanized Brigade (1999 to 2001) and served two tours in Kosovo as Chief of Staff HQ Multi-National Brigade Centre. On promotion to Lieutenant Colonel he was appointed Military Assistant to the Commander-in-Chief Land Forces (2001 to 2002) and later assumed command of 22 Special Air Service Regiment (2002 to 2005), serving principally in Iraq and Afghanistan.
Promoted to Colonel in 2005 he became Deputy Director Policy Planning in the MOD before assuming command of 16 Air Assault Brigade (2006 to 2008) during which time he served in Afghanistan as Commander Helmand Task Force and Commander British Forces Afghanistan. He served in the MOD as Director Army Resources and Plans (2009 to 2011) prior to promotion to Major General as Director Special Forces (2012 to 2015).
He was subsequently Director Strategy at Army Headquarters (2015 to 2016) and latterly assumed the appointment of Deputy Chief of Defence Staff (Military Strategy and Operations) in April 2016. He took up the appointment of Chief of the General Staff in June 2018.