The majority of the injuries were inhalation related, NBC News reported yesterday.
Marines and sailors were training at the Twentynine Palms Marine base "when a fire extinguisher system located within their assault amphibious vehicle inadvertently discharged," the Marine Corps said in a statement.
Those requiring medical treatment were receiving care at local medical facilities and were in stable condition, the statement read.
The Twentynine Palms base is located about 150 miles east of Los Angeles and features a mock town that has been made to resemble an Iraqi city to prepare troops for missions.