Senegalese sailors train aboard the British Royal Navy frigate HMS Argyll (F231) during exercise Saharan Express 2013 in the Atlantic Ocean March 10, 2013. Saharan Express is a counternarcotics and proliferation exercise that is part of Africa Partnership Station (APS) West. APS is an international security cooperation initiative facilitated by Commander, U.S. Naval Forces Europe-Africa aimed at strengthening global maritime partnerships through training and collaborative activities in order to improve maritime safety and security in Africa.