Captain Thomas Nelson, 1st Medical Battalion, 1st Marine Logistics Group, gives a brief to visitors from the medical field on emergency capabilities at the medical exercise on Ocean Beach during San Francisco Fleet Week 22012. More than 800 Marines and sailors from 1st Marine Expeditionary Brigade, Combat Logistics Regiment 1 and the 13th Marine Expeditionary Unit will participate in the annual event from Oct. 3-8 and will showcase humanitarian assistance and disaster relief capabilities to the Bay Area.