Training for LE teams includes pepper spray to the chest for all personnel. You're not allowed to carry it until you've had the "training."
Unless things have changed there is no "gas" chamber training in the CG. Yet? There is CBR training on donning the mask but the practical application ala gas chamber was never instituted.
Disclaimer: I'm not a doctor or a recruiter, nor did I stay at a Holiday Inn Express last night.
Though I strive to ensure accuracy, my information can be dated at times. Please verify all info with a recruiter or your command.