Although not all veterans are severely affected, a military career carries significant mental health risks, particularly at times of war when substantial numbers of psychiatric casualties are usual. Research from the last decade shows that certain mental health-related problems in the armed forces, particularly harmful alcohol use and post-deployment violent behaviour, are a serious problem. Those who have left the forces during the last decade show markedly higher rates of a number of mental health-related problems, particularly PTSD and harmful levels of drinking. These issues are of particular concern in relation to ‘Armed Forces Day’, which serves among other things as a recruitment opportunity for the armed forces. But what are the mental health implications for those who enlist, particularly the youngest recruits who are most vulnerable to these risks?