From July 26, 1991 Los Angeles Times.

FATAL COPTER CRASH AT NUCLEAR TEST SITE PROBED

Investigators from three agencies converged on the Nevada Test Site on
Thursday to probe the wreckage of a security helicopter crash that killed
five people at the top-secret nuclear facility.

Two pilots and three security guards died when the Department of Energy
helicopter crashed Wednesday night in mountainous terrain on the sprawling
test range 110 miles northwest of Las Vegas.

The crash was the worst accident in the history of the 40-year-old facility,
where the nation's nuclear weapons are exploded in periodic underground tests.

Investigators from the DOE, FAA and NTSB were taking part in the investigation,
DOE spokesman Chris West said.

West said the victims were on a routine surveillance flight when the 
Messerschmitt B)-105 helicopter went down shortly after 9:15 p.m., about 20 
miles from where it took off.

Killed were Glenn W. Ewton Jr., 54, and Dennis J. Longman, 48, both pilots 
aboard the helicopter.  West said it was not known which man was flying the 
craft.

Also killed were Richard Lowry, 51, George Tolster, 34, and Robert Brooks, 28, 
all employees of Wackenhut Security, a guard service under contract with the 
department, said another DOE spokesman, Darwin Morgan.

End Article----------------------------

The Santa Ana Register had an even smaller blurb, saying the helicopter was on a 
"night flight certification flight".