MARINE CORPS BASE HAWAII - KANEOHE BAY, Hawaii -- Marines attentively watch as the burning CS gas begins to fill the small half-lit room during annual training at the gas chamber here, April 8. - MARINE CORPS BASE HAWAII - KANEOHE BAY, Hawaii -- Marines attentively watch as the burning CS gas begins to fill the small half-lit room during annual training at the gas chamber here, April 8.