Cpl. David M. Hernandez, 11th Marine Expeditionary Unit, uses a burner to activate tear-gas particles in a chamber here March 10 during training in which approximately 100 unit members drilled with XM50 joint-service general purpose masks. Hernandez, 22, from Orange, Calif., is a chemical-biological-radiological-nuclear defense Marine serving with the unit.

Photo by Gunnery Sgt. Scott Dunn

Masks donned in gas chamber

10 Mar 2011 | Gunnery Sgt. Scott Dunn 11th Marine Expeditionary Unit

CAMP PENDLETON, Calif. -- Chemical-biological-radiological-nuclear defense Marines serving with the 11th Marine Expeditionary Unit instructed approximately 100 unit members here March 10.

The Marines and sailors donned MX50 joint-service general-purpose masks while training in a tear-gas filled chamber.