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Fire retardant gas hits 22 isle Marines

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    This image provided by the U.S. Marine Corps shows Marines from the 13th Marine Expeditionary Unit landing their amphibious assault vehicle Feb. 13, 2013 at Camp Pendleton, Calif. during Exercise Iron Fist.
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TWENTYNINE PALMS, Calif. » Nearly two dozen Hawaii Marines were treated for exposure to a fire retardant gas Thursday after an extinguishing system accidentally went off in an assault vehicle during a training exercise, but there were no serious injuries, officials said.

An equipment malfunction caused the fire suppression system to go off inside a tanklike amphibious assault vehicle during an afternoon exercise at the Marine Corps Air Ground Combat Center at Twentynine Palms, base spokes­man Dave Marks said.

There was no fire or explosion, but 22 Marines were exposed to halon, Marks said.

All of them were taken to the base hospital. Three were kept overnight for observation, and the rest were released to resume training, Marks said.

Halon gas is widely used in fire extinguisher systems because it is relatively nontoxic and leaves no residue, but it can cause breathing problems at high concentrations. The U.S. banned new production of halon in the 1990s because it can deplete ozone in the atmosphere, but its use is still allowed.

The Marines were from the 2nd Battalion, 3rd Marine Regiment, based in Hawaii, and were participating in an integrated training exercise at the Southern Cali­for­nia base, according to the Marine Corps.

They were inside an armored vehicle that is used to ferry Marines from ships to shore when the exposure occurred.

Twentynine Palms, 130 miles east of Los Angeles, is the largest Marine training base in the world. Thousands of Marines take part in live-fire drills in rugged terrain deep in the Mojave desert.

"Ninety percent of the Marines will cycle through here for their combined-arms training," Marks said.

In January two Marine pilots, Capt. Elizabeth Kealey and 1st Lt. Adam Satterfield, were killed when their helicopter crashed during a training exercise at the base. The cause of the crash is under investigation.

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