RIO VISTA, Calif. -- Coast Guard auxiliarists adjust a boat fender for the auxiliary vessel, String of Pearls, which served as a training platform for a multi-agency law enforcement exercise held at Brannan Island State Park, Wednesday, May 4, 2011. Nearly 140 participants from 20 different local, state, federal and private agencies took part in the all-day exercise. U.S. Coast Guard photo by Petty Officer 3rd Class Erik Swanson.