The 1st Battalion Irish Guards have flown into Helmand to start a tour of duty in Afghanistan.
They will be working alongside the Afghan National Army.
It is the Irish Guards' first deployment to Afghanistan as a single unit.
Their commanding officer, Lieutenant Colonel Christopher Ghika said their role in Afghanisation would be critical.
"We have trained really hard to get here. We bring a lot to the campaign and are focussed on what we have to do," he said.