What are the three strategic modes of operation?

• A. Non-intervention, defensive, offensive
• B. Stabilize, decontaminate, recover
• C. Protect, contain, control
• D. Assess, contain, mitigate

Answer: (A)

In hazardous materials incident response, the three strategic modes of operation guide how far you engage the hazard and what approach you take. The options are non-intervention, defensive, and offensive.

Non-intervention means avoiding direct engagement with the hazard if there’s unacceptable risk, focusing instead on keeping people safe by keeping a safe distance, establishing barriers, and isolating the area. The goal is to prevent exposure while enabling safer control measures from outside the hazard zone.

Defensive actions are taken from a safe stance to limit spread and protect exposures without directly attacking the source. This includes setting up containment, barriers, and controlled access to prevent the release from impacting more people or areas, using protective technologies and strategic positioning.

Offensive actions involve direct work on the hazard source to stop or drastically reduce the release, control the contamination at its origin, and begin recovery. This level is only pursued when the scene is assessed as safe enough for direct intervention, with trained teams, appropriate PPE, and a clear plan.

This framing is distinct from other options, which describe incident-management steps or objectives rather than broad strategic modes.