03/24/03, North Arabian Gulf - Boatswain Mate Third Class John M. Mayer, 20, of Long Branch Ca., puts on Mission Oriented Protective Posture (MOPP) gear while Seaman Charity Knoll, 26, of San Diego Ca., assists during a chemical attack drill onboard the U.S. Coast Guard Cutter Boutwell.Coast Guard personnel hae their gas masks with them 24 hours a day while on patrol in the Gulf.