U.S. Navy Lt. Travis Clem, foreground, and Lt. David Trampp, center, both with the Fleet Survey Team, work with Nigerian sailors to construct a tide gauge as part of a cooperative hydrographic survey March 19, 2009, in Lagos, Nigeria, during Africa Partnership Station (APS) 2009. 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. (U.S. Navy photo by Mass Communication Specialist 2nd Class David Holmes/Released)