Violence swept across Mexico Sunday after the leader of the powerful Jalisco New Generation Cartel (CJNG), who had a $15 million U.S. bounty on his head, was killed in a military shootout . A U.S. defense official told CBS News the U.S. military played a role in the operation to take out Nemesio Rubén Oseguera Cervantes — also known as "El Mencho" — via the Joint Interagency Task Force-Counter Cartel, which regularly works with the Mexican military through the U.S. Northern Command. The