May 15, 2020 7:05 pm USNS Mercy Sails Home to San Diego NBC 7’s Dave Summers has a recap of the ship’s mission in Los Angeles. US & World Videos 2:25 Mission Bay Jet Ski driver faces vehicular manslaughter charge in death of child paddleboarder 3:04 Witness of Del Mar shark attack says victim ‘truly fought for his life' 2:53 Shark scientists using new DNA technology to track white sharks in San Diego's waters 2:10 Thousands run in San Diego's annual Rock ‘n' Roll Marathon 0:26 Crews battling fire across US-Mexico border near Otay Mountain