A military helicopter that went missing early Wednesday morning has been located in Pine Valley and rescue operations are now underway for the five Marines on board. The 3rd Marine Aircraft Wing is managing the search and rescue efforts using ground and air assets to locate the aircrew. The U.S. Marine Corps had been searching for the aircraft and five missing Marines after their helicopter did not arrive in San Diego early Wednesday morning. "The last known location was a ping reported to our dispatch center about a mile to two miles northeast of here, that was the last known location of the helicopter at 11:30 last night," said Cal Fire Captain Mike Cornette. He described the location as very remote, very rugged terrain. He said the snow, mud and rain made it difficult to even get to the site. He said Cal Fire crews responded to the scene on foot Tuesday night, but pulled back to get more resources. MORE:https://www.cbs8.com/article/news/local/search-for-marine-helicopter-underway-after-5-on-board-reported-missing/509-a27fd6a9-fa70-4438-ba29-cfa8791e0748