CBRN reconnaissance platoonThere is a long and rich history of nuclear, biological and chemical (NBC) reconnaissance, today also known or called chemical, biological. , Radiological and nuclear reconnaissance (CBRN) within the US military. Researchers and experts believe that as early as 1935, chemical warfare school publications discussed the need to identify, mark, and produce a method to avoid contaminated areas. Avoidance is the most important fundamental principle of NBC defense. In addition to the losses that an attack can cause, the contamination that can result also causes losses and generates long-term dangers that can interfere with the mission. Overcoming these hazards can require enormous amounts of labor and equipment. Finding clean areas when the mission allows reduces casualties and saves resources. (FM 3-100, NBC Operations, 1985).HistoryBefore World War II, the United States War Department issued Field Manual (FM) 21-40, Defense against Chemical Attacks. This field manual combined the concept of traditional reconnaissance with the establishment of a chemical defensive posture enabling rapid force recovery after an enemy attack and the ability to continue offensive operations. Gordon L. Rottman, a former US Army special operations veteran in Vietnam, points out in his book (World War II Combat Reconnaissance Tactics, 2007) that reconnaissance is the reconnaissance activity aimed at gathering information through surveillance and examination of a specific site or enemy forces. their location and activities. During World War II, the United States, Great Britain, the Soviet Union, Germany, and Japan began using battlefield reconnaissance. Each country has shown...... middle of paper ...... chemical warfare operations, although each platoon has a way of operating, it will never deviate from the principles of reconnaissance, maximize the probability of detection, will retain freedom of action, orient towards the reconnaissance objective, report information quickly and accurately, develop the situation quickly and use all capabilities and integrate them to increase the probability of detection. Works CitedUS ARMY (FM 3-100, NBC Operations, 1985)US ARMY (FM 3-11.19, Multi-Service Nuclear, Biological, and Chemical Reconnaissance Tactics, Techniques, and Procedures, 2004) US ARMY (FM 3-11.86, Tactics, Techniques, and multiservice biological surveillance procedures, 2004) Gordon L. Rottman (WWII Combat Reconnaissance Tactics, 2007) - Osprey Publishing. Albert J. Mauroni (Mauroni, America's Struggle with Chemical-Biological Warfare, 2000) Praeger Publisher.