Civil service mariners prepare to spray water on the deck during a simulated chemical spill during a chemical, biological, radiological, nuclear exercise aboard the joint high speed vessel USNS Spearhead (JHSV 1) in the Gulf of Guinea April 18, 2014, during 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)