The two documentaries - Would You Join The Army? and Our War - 10 Years in Afghanistan - are commissioned by BBC1 and BBC3 controller Danny Cohen.
While Would You Join The Army? is a five-part series highlighting the experiences of new army recruits, from training to frontline combat, Our War - 10 Years in Afghanistan is a three-part series which looks at the history of the war and UK's involvement.
Would You Join The Army? is being made by Lion Television, while Our War is being made in-house by BBC Vision.
Cohen said: "We believe that these two projects will be a powerful way to engage young people with the bravery and sacrifice of British soldiers - many of whom are in their teens and 20s themselves."
The BBC Vision director, Jana Bennett, added: "BBC3 has proven that serious factual content is in demand and as a channel it is not afraid of asking important questions, shining a light on serious issues through challenging factual programming."