150422-N-EC444-084 ATLANTIC OCEAN A member of the Mauritanian maritime forces stands security watch during a visit, board, search and seizure drill aboard the Military Sealift Command’s joint high-speed vessel USNS Spearhead in support of Exercise Saharan Express 2015, April 22. Saharan Express is a U.S. Africa Command-sponsored multinational maritime exercise designed to increase maritime safety and security of the waters of West Africa.