U.S. Army sociologists are worried that a lack of black officers leading its combat troops will have detrimental effect on minorities and lead to fewer black officers in top leadership posts. “The issue exists. The leadership is aware of it,” Brig. Gen. Ronald Lewis told USA Today on Thursday. “The leadership does have an action plan in place. And it’s complicated.” The Army reports that only 10 percent of its active-duty officers are black, which has contributed to its dearth of black officers leading soldiers with occupational specialties in infantry, armor and artillery. “It certainly is a problem for several...