A consulting psychiatrist summarizes some aspects of 4 years' experience in the British army. 30% of the total manpower wastage in Great Britain is attributed to psychiatric illnesses. Battle neurosis accounts for 10-15% of all casualties. In Tunisia and Italy, when active treatment was given near the front line, 60% or more of these men were returned to full combat duty. The shortage of manpower led to the devising of many methods of using men who could only be of limited service. Psychotics can be kept in military hospitals for 6 or 9 months if they are responding to treatment. Only 5% have had to be certified on discharge from the army. The defective or dull have given excellent service in the unarmed Pioneer Corps. Many thousands of the chronic psychoneurotic group have been assigned to special jobs in the armed services, and some 50% of these have performed efficiently without breakdown. The proper selection of men for the armed services and for officer Cadet Training Units increases general efficiency and is preventive medicine of a high order. Good morale, good leadership, and good discipline sharply reduce the tendency to breakdown under battle stress. The Eighth Army is cited as a conspicuous example.