Lt Chesterman, a Platoon Commander in C Company, was commanding a patrol convoy in the Nad-e Ali district when the lead vehicle struck an improvised explosive device.
The Ministry of Defence said the soldiers were part of a patrol travelling along Route 611 between Forward Operating Base Ouellette and Patrol Base Lashkar Gah Durai in Nahr-e-Saraj when their vehicle was hit by an improvised explosive device.