150704-N-ZZ999-016 ABIDJAN, Cote d’ Ivoire Senior Chief Navy Diver Donald Schappert and Navy Diver 2nd Class Octavio Alvarez, Sailors assigned to Mobile Diving and Salvage Unit 2-4, demonstrate the use of a full face mask for SCUBA aboard the Military Sealift Command rescue and salvage ship USNS GRASP during a diving exercise in support of theater security cooperation in Abidjan, Cote d’Ivoire, July 4, 2015. U.S. 6th Fleet, headquartered in Naples, Italy, conducts the full spectrum of joint and naval operations, often in concert with allied, joint, and interagency partners, in order to advance U.S. national interests and security and stability in Europe and Africa.