Crews searching off San Diego for survivors of a midair collision still have not found any.9 US military personnel are still missing after a Marine helicopter and a Coast Guard plane collided.It happened Thursday night as a Coast Guard plane was searching for a boater.The marine helicopter was flying in formation with three other choppers on their way to a military training islandThe search is focused around fifty miles off the San Diego coast.A Pentagon spokesman says despite the ongoing search, it is likely the nine were killed in the crash.