Executive Director of the UN Environment Program Achim Steiner (2nd L, front) speaks to trainees during the opening ceremony of a ranger school in Menongue, Cuando-Cubango, Angola, June 4, 2016. Officially unveiled by Executive Director of the UN Environment Program Achim Steiner, the ranger school which will turn former soldiers into protector of nature opens on Saturday, one day before the World Environment Day, showcasing the country's resolve to fight illegal trade in wildlife and to promote tourism