Seven Marines and four soldiers who were in the helicopter presumed dead , the military said on Wednesday . Debris was seen washing up on a military-owned stretch of beach on Wednesday morning . The U.S. Navy is investigating what caused the crash.
Seven Marines and four soldiers who were in the helicopter presumed dead , the military said on Wednesday . Debris was seen washing up on a military-owned stretch of beach on Wednesday morning . Military spokesperson confirmed that human remains had been found but could not say from how many people . Crash happened on Tuesday night when area was under a fog advisory . Local pilots were used to region 's foggy conditions , military spokesperson told Daily Mail Online , while out-of-town pilot may not have been . Missing Marines were from Camp Lejeune in Jacksonville , North Carolina . The soldiers were from a National Guard unit based in Hammond , Louisiana .