U.S. Sailors and civil service mariners heave mooring lines aboard the joint high speed vessel USNS Spearhead (JHSV 1) as the ship arrives in Lagos, Nigeria, April 13, 2014, in support of the upcoming Obangame Express 2014. Obangame Express is a maritime exercise conducted by U.S. Naval Forces Africa to improve cooperation among African partner nations in order to increase safety and security in the Gulf of Guinea. (U.S. Navy photo by Mass Communication Specialist Seaman Justin R. DiNiro/Released)