Semper Durus 2018: Exercising Readiness - In the event of a serious emergency, an Emergency Operations Center (EOC) is established to ensure that regional command and control is performed to the highest standard. Exercise Semper Durus 2018 is an annual exercise conducted by Marine Corps Base - Camp Pendleton to improve response procedures and limit impact during a crisis situation. Representatives from various commands come together in an EOC and act as puzzle pieces, each playing their own role in building a clear picture of mission success. (U.S. Marine Corps photo by Cpl. Dylan Chagnon)