SAN DIEGO (AP) — Multiple agencies continued to search Sunday for a U.S. Marine who went missing during a training exercise off the coast of southern California, military officials said.Crews began searching for the Marine early Thursday morning, shortly after midnight, according to a Navy news release. The Marine was reported missing from the USS Anchorage during integrated training between the Makin Island Amphibious Ready Group and the 13th Marine Expeditionary Unit.It’s at least the second time in six weeks that the U.S. military has been forced to look for missing members. The remains of the second of two U.S....