The Minnesota Personality Test was studied to determine its possible value in the selection of officers charged with combined duties of military and scientific nature. The relationship of the personality profiles of a series of 28 officers, studied over a period of one year or more, with this unusual type of assignment is correlated with their emotional stability and success in the performance of duties. Lack of adaptation or impairment of efficiency in the series reported is correlated under certain conditions with high Lie, Validity and Hypomanic scores as well as with general elevation of the scores. High values of the Hy and Mf scores are frequently found in the series studied. On the basis of this series it appears that if a normal personality curve is obtained, and if the stable performance of military personnel in a field where combined military and scientific efficiency is required, the Minnesota Inventory may provide an adjuvant screening device. As more data of the type here given are obtained, further refinements of the screening process will increase the precision of the method.