NEW : Burzynski said the helicopter was operating from the USS Nimitz . Rescuers still searching for Three people missing from around 11:30 p.m. crash . U.S. Navy using helicopters and boats to search ocean for crew . Copter was doing training off coast of San Diego , near Mexico , when it crashed .
NEW : Rescuers still searching for Three people missing from around 11:30 p.m. crash . U.S. Navy using helicopters and boats to search ocean for crew . Copter was doing training off coast of San Diego , near Mexico , when it crashed .