All contracts for flying for the UN in Africa is carried out by the WFP oin Rome.
Most of the flying that is done around the Horn of Africa for the UN is controlled from Nairobi. The UN use mainly C-208, DHC 6,
DHC-5, Hercules, IL 76's Beechcraft King Air's. In order to get a job with one of these companies you are going to need a Kenyan Licence. You can only get this by going there and sitting the test. Then you can apply to one of the companies that fly for the UN.