(Photo: Shutterstock) I n the spring of 2014, the Army banned black women soldiers from wearing natural hairstyles like cornrows, even though those easy-care looks meant that some women could give up the scalp-damaging chemical relaxers used to straighten tightly curled African American hair. The Army endured weeks of withering abuse and a congressional intervention before the service finally ditched the policy. Today, the Army and other branches spell out precise haircare parameters that permit natural styles that do not run afoul of grooming regulations. The Mystic Valley Regional Charter School in Malden, Massachusetts, a Boston suburb, apparently missed this heads-up on the absurdity of forcing African Americans to conform to white haircare grooming standards. African American students make up 20 percent of the nearly 1,500 students at the K–12 school and outperform their peers in the region. But as the furor over the school’s discriminatory hair policies simmers, school officials...