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An Okaloosa County ambulance sits at the Eglin Air Force entrance in Fort Walton Beach, Fla., Wednesday, March 11, 2015. Seven Marines and four soldiers aboard an Army helicopter that crashed over waters off Florida during a routine night training mission were presumed dead Wednesday, and crews found human remains despite heavy fog hampering search efforts, military officials said. (AP Photo/Northwest Daily News, Devon Ravine)
An Okaloosa County ambulance sits at the Eglin Air Force entrance in Fort Walton Beach, Fla., Wednesday, March 11, 2015. Seven Marines and four soldiers aboard an Army helicopter that crashed over waters off Florida during a routine night training mission were presumed dead Wednesday, and crews found human remains despite heavy fog hampering search efforts, military officials said. (AP Photo/Northwest Daily News, Devon Ravine)

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    Desperate search for 11 service members

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Desperate search for 11 service members

Human remains and debris have been recovered Black hawk chopper crashed. Seven marines and 4 soldiers were onboard. CNN's Victor Blackwell reports.

Desperate search for 11 service members

Human remains and debris have been recovered Black hawk chopper crashed. Seven marines and 4 soldiers were onboard. CNN's Victor Blackwell reports.