Private Tom Wroe, who was shot in Afghanistan on Saturday, had only been in 3rd Battalion, The Yorkshire Regiment for a few months.
According to his commanding officer, Lieutenant Colonel Zachary Stenning MBE, he had "pushed hard to join the Regiment in Afghanistan" at the soonest opportunity.
He added that despite his young age, he had impressed his colleagues with his degree of professionalism and commitment.
Two British soldiers who were shot dead on Saturday by a man in Afghan police uniform who was pretending to be injured have been named.
Two British soldiers have been killed in a 'green-on-blue' attack on Saturday.