Evening Standard reports. The Duke of Sussex, a 10-year veteran of the British Army, said in a statement, "There should be no difference between how we view our physical fitness and mental fitness and training both will help our service men and women excel, as well as being best prepared for what they may face, in any situation."Harry previously spearheaded military mental health initiative HeadFIT, launched in April this year, which provides online self-help tools for members of the armed forces.