"The history of chemical agent analysis can be traced to the 17th century. The development of U.S. Army detectors, alarms, and warning systems dates back to World War I when chemical warfare was first introduced on a large scale. The next generation detectors, alarms, and warning systems will be revolutionary advancements in chemical and biological agent detection technology. This brief history will cover some of the highlights of the long history of chemical and biological agent detection technology."
U.S. Army, 84th Chemical Battalion, 3rd Chemical Brigade: http://www.wood.army.mil/84chem/