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Why might a military force use a nonpersistent chemical agent during an attack?
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chemical weapon
American soldiers participating in a simulated gas attack exercise, World War I.
A military force might use a nonpersistent chemical agent when it seeks only a temporary effect on the battlefield. Because these agents evaporate quickly—often within minutes or hours—they are strategically useful for operations where a force intends to advance through or occupy an area shortly after the attack has occurred.1
In contrast to persistent agents, which are used to deny the enemy access to key areas like seaports or air bases for an extended duration, nonpersistent weapons allow for greater tactical flexibility by ensuring the target zone becomes safe for one's own troops to enter once the chemical effects have dissipated.1