An explosive ordnance disposal Marine explains how a metal detector works to an onlooker during San Diego Fleet Week 2015 at Naval Base Coronado, Calif., Sept. 20, 2015. Thirty-seven Marines from 7th ESB presented static displays during the event to demonstrate the quality of military assets to the citizens of San Diego. - An explosive ordnance disposal Marine explains how a metal detector works to an onlooker during San Diego Fleet Week 2015 at Naval Base Coronado, Calif., Sept. 20, 2015. Thirty-seven Marines from 7th ESB presented static displays during the event to demonstrate the quality of military assets to the citizens of San Diego.