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			 Some human remains had washed ashore, said a spokeswoman for Eglin 
			Air Force Base in north Florida. 
 Officials did not immediately release information on what caused the 
			crash involving the Marines and four members of the Louisiana 
			National Guard. Heavy fog was reported around the time the 
			helicopter was reported missing around 8:30 p.m. on Tuesday. Fog 
			hampered the search effort on Wednesday.
 
 A U.S. military official, speaking on condition of anonymity, said 
			the 11 service members aboard were presumed to have died in what 
			could be among the deadliest domestic military training accidents in 
			years.
 
 One of two UH-60 Black Hawk helicopters participating in the routine 
			exercise crashed near the base 50 miles (80 km) east of Pensacola, 
			and rescue workers discovered debris about 2 a.m. on Wednesday, the 
			base said in a statement.
 
 The other helicopter "started to take off and then realized, I 
			guess, that the weather was a condition and turned around," Major 
			General Glenn Curtis of the Louisiana National Guard told reporters.
 
 
			
			 
			The second helicopter landed safely, the military said. Names of the 
			missing troops were being withheld.
 
 The Marines were part of a special operations unit from Camp Lejeune 
			in North Carolina conducting amphibious "helicopter and boat 
			insertion and extraction training" focused on getting troops in and 
			out of specific areas, according to a Marine Corps statement.
 
 "Our complete attention is on locating our fellow Marines," the 
			statement said.
 
 The four crew members and the helicopter were part of the Louisiana 
			National Guard, assigned to an Army unit based in Hammond, 
			Louisiana. All four were married men with children, Curtis said.
 
 They were part of a highly experienced helicopter battalion, Curtis 
			said, noting the two pilots were instructors and had "several 
			thousand hours" of flying experience with their crew.
 
 President Barack Obama phoned military officials to express 
			condolences, White House spokesman Josh Earnest told reporters, 
			noting the president anticipated a detailed investigation.
 
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			The helicopter that crashed had a flight data recorder that will be 
			part of the investigation, a Louisiana guard official said.
 The incident occurred near an Air Force base spanning nearly 500,000 
			acres (200,000 hectares) in the Florida Panhandle that is used 
			extensively for training.
 
 General Martin Dempsey, the top U.S. military officer, told a U.S. 
			Senate hearing that the "loss of the folks on that helicopter" 
			served as "a reminder to us that those who serve put themselves at 
			risk both in training and in combat."
 
 In February 2012, seven Marines were killed when two helicopters 
			collided during a nighttime training exercise along the 
			California-Arizona border.
 
 The following year, another seven Marines died in an explosion at a 
			Nevada munitions depot after a mortar round detonated prematurely 
			during a live-fire training exercise.
 
 (Additional reporting by Suzannah Gonzales, Phil Stewart, Curtis 
			Skinner, Jonathan Kaminsky and Roberta Rampton; Editing by Peter 
			Cooney and Will Dunham)
 
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