U.S. Secretary of State John Kerry paid tribute to an American female diplomat who was among six NATO personnel killed in two attacks in Afghanistan on Saturday. Kerry, who had met the unnamed victim during a visit to Kabul last week, described her as “smart, capable, eager to serve and deeply committed to our country and the difference she was making for the Afghan people.” He offered his condolences to her relatives for their “immeasurable loss.” The diplomat was killed in an attack that also claimed the lives of three American soldiers, an Afghan civilian NATO worker and an unknown...