"The MLDC [Military Leadership Diversity Commission] has been tasked with assessing promotion opportunities by race, ethnicity, and gender. To that end, in this issue paper, we present statistics that describe the promotion rates of female and minority officers. Recent data show that black, Hispanic, and other minority line officers had lower-than- average promotion rates to O-4 and O-5 in several Services. Female officers in the Navy, the Army, and the Coast Guard also had lower than-average-promotion rates to these grades. Several of the differences are large enough to merit further investigation. In addition, the differences in recent promotion rates between minority and majority officers were not very different from differences in promotion rates between minority and majority officers ten or more years ago."
Military Leadership Diversity Commission Issue Paper No. 45
Department of Defense Office of Diversity Management and Equal Opportunity: http://diversity.defense.gov/