How many types of chemical agents are recognized in military contexts?

In military contexts, four distinct types of chemical agents are recognized, which are categorized based on their intended effects and modes of action. These categories include:

1. Nerve Agents: Highly toxic compounds that disrupt the nervous system, leading to respiratory failure and other critical physiological effects.

2. Blister Agents: These agents cause severe skin, eye, and respiratory tract damage, leading to painful blisters and long-term health issues.

3. Choking Agents: Designed to cause damage to the respiratory system, choking agents can result in suffocation or lung damage.

4. Riot Control Agents: Though intended for crowd control, these chemicals can cause temporary incapacitation through irritation of the eyes, skin, and respiratory tract.

The classification and understanding of these four types are crucial for military personnel to recognize the potential threats posed by chemical warfare and respond effectively during engagements.