Grant was actively involved in planning Canada's contribution to the "Campaign Against Terrorism" which included the first deployment of the Canadian Forces in Afghanistan.
Grant was in command of numerous Canadian Forces units throughout his career, ranging from a single troop to the brigade level in both Canada and in Germany (with NATO).
As commanding officer of Lord Strathcona's Horse (Royal Canadians), he was deployed with his battle group to Bosnia in 1997 with NATO's SFOR.
Grant was in command of the 1 Canadian Mechanized Brigade Group from 2003 until 2005, which included a deployment to Kabul as part of the International Security Assistance Force and the first Canadian-led Provincial Reconstruction Team to Kandahar.
He retired from the Canadian Armed Forces in August 2008, immediately joining the civil service of the Government of Alberta, and as of 2023 has been a deputy minister in various ministries since October 2011.