U.S. 5TH FLEET AREA OF RESPONSIBILITY (Dec. 12, 2014) A U.S. Marine with Weapons Company, Battalion Landing Team 2nd Battalion, 1st Marines, 11th Marine Expeditionary Unit (MEU), prepares an 81mm mortar round during a joint mortar range with Royal Saudi Naval Forces Marines with the 3rd Marine Infantry Battalion during exercise Red Reef 15 in the U.S. 5th Fleet area of responsibility, Dec 12, 2014. Red Reef, is part of a routine theater security cooperation engagement plan between the U.S. Navy, U.S. Marine Corps and Royal Saudi Naval Forces that serves as an excellent opportunity to strengthen tactical proficiency in critical mission areas and support long-term regional security.