Major Carnegie has an extensive military career, with over 28 years experience in the British Army. He initially served in the 1st Battalion the Gordon Highlanders, before transferring into the Royal Army Veterinary Corps. 
Major Carnegie has served in a variety of regimental, multinational, staff and training appointments. He has worked with a wide range of agencies, developing tactics, techniques and procedures, most notably providing instruction to the United States Army in the operational use of mine detection dogs. He has also provided extensive training and support to the United Kingdom Special Forces, predominantly in the jungle environment. Overseeing and implementing change throughout his career he is a strong advocate of capability generation and oversaw the raising of the United Kingdoms’ 1st Military Working Dog Regiment.  
In 2014 Major Carnegie fulfilled his long term ambition to laterally transfer into the Australian Defence Force where he has served in a variety of regimental, staff and training appointments. In 2019 he assumed his current position as the Senior Instructor of the Logistics Officer Training Wing at the Army School of Logistics Operations. 
Major Carnegie’s operational experience is extensive, including service in Bosnia on Operation LOADSTAR where he was attached to the 1st Battalion the Royal Canadian Regiment Battlegroup. For this deployment he was Mentioned in Despatches for gallantry. In 2003 he deployed to Kosovo on Operation OCULUS where he supervised the drawdown and redeployment of key UK capabilities to Operation TELIC in Iraq. In 2006 he deployed to Helmand Province in Afghanistan on Operation HERRICK, commanding the Theatre Military Working Dog Support Unit. His operational experience also includes a significant period deployed on counter terrorism operations on Operation BANNER in Northern Ireland and on Defence Aid to the Civil Community operations in the aftermath of the Lockerbie Air Disaster.