A US Army UH-60 Blackhawk helicopter, like the one shown above, crashed during a night training exercise near Eglin Air Force Base in Florida late yesterday, leaving its 11 crewmembers missing and presumed dead.

According to USA Today, four of the eleven on board are members of a Louisiana Army National Guard unit, based in Hammond, LA. The seven Marines, meanwhile, were based out of Camp Lejeune in North Carolina, and were members of MARSOC, the NBC affiliate around the sprawling Marine Corps base confirmed. The names of the servicemen involved in the incident are not currently being released.

The cause of the crash remains unclear as of this writing, although there were reports of heavy fog, which has carried on through into the morning. That's hindered the efforts of search-and-rescue teams, which have been combing the military-owned beaches between Pensacola and Destin, in the Florida panhandle since last night. Debris from the down chopper was discovered at 2:00 a.m. this morning, Andy Bourland, a spokesman for Eglin AFB told USA Today.

A second Blackhawk was also part of the training exercise, although it returned to Eglin safely.

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