SAN ANTONIO -- In the battlefield, their role is to treat and move casualties of war.

Their training is extremely critical for troops in battle against Iraq.

A U.S. Army unit, known as "Combat Lifesavers," recently trained at Camp Bullis, where soldiers reacted to a simulated Army helicopter crash.

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Watch Training Of 'Combat Lifesavers'

It was the job of the members of the 232nd Medical Battalion to move in to get the wounded out.

The simulation also included the company coming under fire, which prepared the soldiers for a combatlike situation.

Among the first duties for the soldiers is to separate the casualties according to injury. They then treat the wounded and move them to evacuation trucks.

"This is an infantry platoon, said Sgt. 1st Class Jerome Davis. "Their job is to extract these folks. They have to treat patients, but they have to remember that the enemy is still out there. And if they're not careful, we'll have more casualties."

Although the possibility of chemical warfare has always existed, soldiers also learn to use 256 kits to detect and identify a possible chemical element in the area.

"Now we know that we face an enemy that will use chemicals against us, Davis said. "If you can't detect them, they will kill you."