This thesis fills in gaps within research into the psychological and emotional consequences of combat by addressing the question ‘What is the role of guilt in coping with killing a military opponent at close range?’. The focus is on killing and guilt: psychological and psychosocial processes, communication and reflections on killing. The data is based on in-depth interviews with veterans in London who have killed in combat. Guilt has the function of guiding moral behaviour. The exercise of personal conscience, or feeling guilty about killing, could undermine the drive to kill and seriously threaten an entire military enterprise. However, by having some feelings of guilt, a modern soldier feels he is a responsible and conscientious person. T...