I thought the manufacture and use of Halon had been banned decades ago?
"The chemical constituents in Halon gases, and the products of the reactions they induce when discharged on fires, have been identified as causing damage to the Ozone layer. As a result, their manufacture and use have been banned for many years in most countries and non-essential uses have been eliminated. Nevertheless, they remain widely in use on board aircraft for most applications because of the difficulty in finding alternatives."
SKYbrary - Halon Fire Extinguishers