A blue DOD label indicates what hazard?

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Blue labels on DOD hazard signs warn about health risks to people handling or being exposed to the material. They flag potential toxicity, irritation, or other effects on the body, so the emphasis is on protecting you from harm. The option describing materials that react violently with water and produce poisonous gases fits this health-hazard focus because releasing toxic gases directly threatens health and requires protective measures. Other options refer to different kinds of hazards: highly pressurized gases involve a physical hazard from pressure, corrosive materials carry a separate warning for damage to skin or equipment, and water-based solvents are typically associated with flammability or solvent exposure rather than a health hazard indicated by blue. Therefore, the blue label best aligns with a health hazard such as gases that could poison you if released.