The crash of a Marine helicopter, like the one shown, that killed five Marines was ultimately caused by pilot error, but night vision goggles and unsafe flying conditions also likely were factors ...

Weather, night vision goggles likely factors in deadly Marine chopper crash Sgt. Alec Langen, of Chandler, was among 5 Marines killed in the crash ...

Weather and night vision goggles were likely factors in Marine Corps helicopter crash, report finds BY Associated Press Washington, D.C.

The limits of night vision goggles also have been identified as a potential factor in the fatal collision of an Army Black Hawk helicopter and a passenger jet near Reagan Washington National ...