U.S. Marine Corps Lt. Col. Alexander H. Miller, senior watch officer, Marine Corps Installations West, Marine Corps Base, Camp Pendleton, far right, gives the 'Commander's Update Brief' to U.S. Marine Corps Brig. Gen. Kevin J. Killea, commanding general, MCIWEST-MCB, Camp Pendleton, during exercise Semper Durus 17 on Camp Pendleton, Calif., April 13, 2017. Semper Durus is a regional command post exercise and is comprised of a series of field training scenarios designed to improve regional command and control, enhance interagency coordination, and improve installation capabilities to respond to, and recover from, a crisis event and validate the installation mission assurance all-hazard plan. - U.S. Marine Corps Lt. Col. Alexander H. Miller, senior watch officer, Marine Corps Installations West, Marine Corps Base, Camp Pendleton, far right, gives the 'Commander's Update Brief' to U.S. Marine Corps Brig. Gen. Kevin J. Killea, commanding general, MCIWEST-MCB, Camp Pendleton, during exercise Semper Durus 17 on Camp Pendleton, Calif., April 13, 2017. Semper Durus is a regional command post exercise and is comprised of a series of field training scenarios designed to improve regional command and control, enhance interagency coordination, and improve installation capabilities to respond to, and recover from, a crisis event and validate the installation mission assurance all-hazard plan.