 Researchers at the Bureau of Mines had experience in developing gas masks for miners, drawing poisonous air through an activated carbon filter.After the Director of the Bureau of Mines, Van H. Manning, formally offered the bureau's service to the Military Committee of the National Research Council, the council appointed a Subcommittee on Noxious Gases.Manning recruited chemists from industry, universities, and government to help study mustard-gas poisoning, investigate and mass-produce new toxic chemicals, and develop gas-masks and other treatments.