ABUJA, Nigeria ? U.S. Africa Command's two deputies, Vice Admiral Robert T. Moeller and Ambassador Mary Carlin Yates, accompanied by the U.S. Embassy's Charge D'Affairs Lisa Piascik, greet Executive Secretary of Economic Community of West African States (ECOWAS), Dr. Mohammed Ibn Chambas, at the ECOWAS headquarters on November 28, 2007. Nigeria was one of three countries Yates and Moeller visited on a pan-African trip to explain U.S. AFRICOM. They also visited Burkina Faso and Djibouti.