U.S. Marine Corps Lt. Col. Alexander H. Miller, senior

U.S. Marine Corps Lt. Col. Alexander H. Miller, senior watch officer, Marine Corps Installations West, Marine Corps Base, Camp Pendleton (MCIWEST-MCB), gives the 'Commander's Update Brief' to the commanding general of 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 photo by Cpl. Brandon Martinez)