Prince Harry is encouraging military personnel to stay mentally fit with his latest project. On Monday, the 35-year-old Duke of Sussex launched HeadFIT, a project that's been in development for three years with the Ministry of Defense and The Royal Foundation's campaign, Heads Together, which Harry, Prince William and Kate Middleton launched in 2016.The 24/7 resource encourages military personnel to take a proactive approach to mental fitness with self-help tools that can enhance mood, drive and confidence, while also helping to manage the stresses of everyday life.«I’ve long believed the military community should lead the way for the rest of society.