The effect of varying the percentages of female soldiers assigned to representative types of Test, Operation, and Evaluation units on the unit's capability to perform its mission under field conditions was assessed. Empirical data were provided to test the null hypothesis that increasing the proportion of women in selected units would not impair unit performance. The basic concept was to test task performance in a total of 40 combat support and combat service support companies which were broken down into five different types of units: Medical, Maintenance, Military Police, Transportation and Signal. Within each unit type, eight companies were selected and designated as experimental, control, or calibration. Two experimental companies were tested twice, at varying fills of enlisted women (EW); the time between tests was six months. The control company was also tested twice with the EW fill stabilized for both tests. Five calibration companies were tested only once, with whatever percentage of women they contained. The comparisons of major interest involve companies that went from 0% to 15% EW and those that went from 15% to 35% EW. On the average, the former showed a slight decrease in performance scores while the latter showed a slight increase in performance scores. In neither case, however, were the changes statistically significant. (Author/MV)