Dame Kelly Holmes returns to the army training grounds where she enjoyed a successful career as a physical-training instructor during one of the most tumultuous periods in the history of the British Army. As she meets the first woman to become an army commando and a female WWII veteran who drove injured soldiers returning from the battlefield, she also joins the basic training of a batch of male and female recruits starting out on their army careers together. Kelly also has the opportunity to fulfil a long-held ambition when she takes command of a Challenger 2 tank.