Cpl. Anthony Blumenthal, 11th Marine Expeditionary Unit, drinks from a canteen attached to his XM50 joint-service general-purpose mask in a tear-gas filled chamber here March 10. Blumenthal, 21, from Chicago, and approximately 100 unit members, drilled with the masks as part of chemical-biological-radiological-nuclear defense training 

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.

Cpl. Anthony Blumenthal, 11th Marine Expeditionary Unit, lets tear gas into his XM50 joint-service general-purpose mask, part of chemical-biological-radiological-nuclear defense training here March 10. Blumenthal, 21, from Chicago, and approximately 100 unit members, drilled with the masks in a tear-gas filled chamber.

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