An explosive ordnance disposal technician undergoes the decontamination process after leak, seal, package and decontamination training April 21 at the gas chamber on Camp Hansen, Okinawa. Explosive ordnance disposal technicians and chemical, biological, radiological, nuclear defense specialists placed a leaking ordnance package in the gas chamber, using chlorobenzylidene malonitrile, also known as tear gas, to simulate the emission of harmful gases. - An explosive ordnance disposal technician undergoes the decontamination process after leak, seal, package and decontamination training April 21 at the gas chamber on Camp Hansen, Okinawa. Explosive ordnance disposal technicians and chemical, biological, radiological, nuclear defense specialists placed a leaking ordnance package in the gas chamber, using chlorobenzylidene malonitrile, also known as tear gas, to simulate the emission of harmful gases.