It is difficult to define the best treatment for peptic ulcer because the effectiveness of treatment may be measured in many different ways, each affecting the Therapeutic objectives might include relief of symptoms, healing of ulcer, prevention of complications, prevention of relapses, and social or occu pational rehabilitation. Despite the multiplicity of objectives, most clinicians will have some concept of what constitutes an acceptable or an unacceptable of treatment for each patient. In the British Army, compared with civilian life, certain criteria require to be more heavily emphasised than others in considering outcome. Fitness to perform his duties emoiently and continuously is a sine qua non of a serviceman's employment. If a medical defect exists which actually or potentially restricts his employalbiHty he must be either invalided from the service or medically down graded; the latter may render him ineligible for consideration for promotion and thereby ruin his career. Because he is expensive to train a new recruit will be more readily invalided from the service than a mature, fully-tl'a'ined specialist, the loss of whom would be a more catastrophic event both for the service and for the individual. Although only a small proportion of servicemen with peptic ulcer are invalided, this disease remains the single most common cause of invaliding from the British Army (Statistical Report on the Health of the Army, 1975). This fact is well known to service olinicians but despite this there is no unanimity as to the best approach to management, nor to the difficult qu~tion of the degree of medical downgrading or restriction upon employability indicated for peptic ulcer patients in various circumstances. Any data which throw light upon this problem are useful. This paper presents a retrospective analysis of the outcome of medical versus surgical treatment for peptic ulcer in a cohort of serving personnel in the pre-Cimetidine era. Patients and methods All personnel serving in the British Army who were first diagnosed during the year 1965,as having a peptic ulcer were identified and their medical documents examined. Reports of all out-patient attendances, hospital admissions,