After Germany's employment of gas warfare during World War I at Ypres, Belgium on April 22, 1915, technological and physiological research into gas warfare was carried out in Britain by exceptional scientists called Fritz Haber. , who was responsible for developing poison gases for Germany during World War I, was also responsible for developing the crucial process of extracting nitrates from the atmosphere. In the United States, the War Department, in the fall of 1915, began to take an interest in protecting troops against gases and assigned responsibility for the design and development of respirators to the Medical Department, resulting in the rapid development of protective equipment and the subsequent development of respiratory devices. development of offensive equipment; this accumulation of valuable experience was later available to the United States. The Chemical Section was created to respond to General Pershing's request repeated 5 times between September 26 and December 9, 1918, General Pershing requested a chemical laboratory, complete with equipment and personnel responsible for examining gases and powders, then General Order Number 62 of the War Department, dated June 28, 1918, provided for the implementation of a decree for the creation of this separate technical service with full responsibility for conducting investigations, research development and the production of protective equipment and to provide American arsenals with a family of toxic agents capable of being used effectively in war. The 30th Gas and Flame Engineering Company became the first combat unit of the chemical warfare service under the AEF (France) flag. When the 30th Engineer Group, Gas and Flame, was transferred to the Chemical Warfare Service, it was redesignated as ...... middle of paper ......e mid-1980s. Between 1979 and 1989 , the Army established 28 active-duty chemical defense companies. Second War (1989) The Chemical Warfare Service: Organizing for War, the Interwar Years, the Chemical Warfare Service, the National Army. II (1) 18-43, 393-400 Frank C. Conahan, Report to Congressional Requesters, (1991) Chemical Warfare, Soldiers Inadequately Equipped and Trained to Conduct Chemical Operations, Steven L. Hoenic Handbook of Chemical Warfare and Terrorism ( 2002) Introduction: Brief History of Chemical Agents 1 (1) 3-22The Basic History Instructional Segment (2006) CML DVD 143National Museum United States Army website https://armyhistory.org /09/the-us-army-chemical-corps/