Seven Marines die in copter collision

SAN DIEGO – A collision that killed seven Marines in one of the Marine Corps’ deadliest aviation training accidents in years occurred over a sprawling desert range favored by the U.S. military because its craggy mountains and hot, dusty conditions are similar to Afghanistan’s harsh environment.

Officials were scrambling Thursday to determine what caused the AH-1W Cobra and UH-1 Huey to crash during a routine exercise Wednesday night when skies were clear and the weather was mild.

There were no survivors in the accident near the Chocolate Mountains along the California-Arizona border.

It was the fifth aviation accident since March involving the 3rd Marine Aircraft Wing headquartered at Miramar Marine Corps Air Station in San Diego. Throughout the Navy and Marine Corps, there have only been two other aviation training accidents in the past five years involving seven or more deaths, according to the military’s Naval Safety Center.

“It’s an unfortunate consequence of the high tempo of operations,” said retired Marine Col. J.F. Joseph, an aviation safety consultant. “They’re out there working on the edge trying to exploit the maximum capabilities of the aircraft and their tactics. Just by the virtue of that, in becoming combat ready, these unfortunately are not uncommon occurrences.”

The helicopters collided near dunes at the edge of the Yuma range about an hour before the range was to shut down for the evening. Ground troops were in the area, but they were not affected, said Gunnery Sgt. Dustin Dunk, a spokesman at the Yuma base, which is a 90-minute drive from the accident site.

Part of the exercise involved having helicopters low on fuel descend to ground troops that have set up a refueling outpost, Dunk said.