The Health and Wellbeing of UK Armed Forces Personnel study is a large-scale investigation of the physical and psychological health of around 16,000 UK military veterans. When it started in 2003, the main aim of the study was to look at the health of those who had deployed to Iraq on Op TELIC, and was later expanded to also look at the possible effects of deploying to Afghanistan on Op HERRICK. The study is also an opportunity to look at issues that are relevant to the Armed Forces in general, and how people manage once they leave Service.