Combat Stress is a UK charity offering residential treatment to ex-servicemen and women suffering from Post Traumatic Stress Disorder (PTSD) and other mental health issues. The Ex-Services Mental Welfare Society was formed in the United Kingdom in 1919 just after the First World War when the effects of Shell Shock were becoming known. During the 1980s it became known as Combat Stress for public relations purposes although legally is still known by its original name. It is a registered UK Charity.