What system offers protection for unlaundered JLIST suits against chemical agents for up to 120 days?

The system that provides protection for unlaundered Joint Light Weight Integrated Suit Technology (JLIST) suits against chemical agents for up to 120 days is the uncontaminated environment. In this context, "uncontaminated environment" refers to situations where the suits are not exposed to chemical agents on a persistent basis, allowing the protective properties of the suits to remain intact for an extended duration.

The effectiveness of JLIST suits relies on their ability to serve as a barrier against chemicals when the environment is clean. When the suits are worn in such conditions, they retain their designed protective capabilities, thus maintaining their functionality for up to the specified period.

The other environments outlined do not provide the same level of protection as an uncontaminated environment. A contaminated environment exposes the suit to harmful agents that could compromise its integrity. Dewatering environments relate more to water management and do not pertain directly to the protective capabilities of the suits against chemical agents. A high-risk environment typically indicates potential exposure to various threats, making it less favorable for the suits' effectiveness without proper laundering or maintenance.