By KELIN DILLON Seven years after 43 male students from Mexico’s Ayotzinapa Rural Teachers’ College were kidnapped and disappeared on Sept. 26, 2014, the students’ parents have demanded the federal government and President Andrés Manuel López Obrador (AMLO) deepen investigation into the army’s purported role in the tragic event. Allegations and evidence of the 27 Infantry Battalion of Iguala’s involvement