Placards may be omitted for transportation of Hazard Division HD ______ material on base provided the responsible Commander approves in writing.

• A. HD 1.2 material
• B. HD 1.4 material
• C. HD 1.1 material
• D. HD 2.1 material

Answer: (B)

Placards are there to alert people to the explosive hazards being transported. When moving on a military base, there is an allowance for certain low-hazard explosives to be moved without placards, but only for the material that presents the least risk and only with written approval from the responsible Commander. Hazard Division 1.4 is the category that fits this exemption because these materials have only a minor explosive hazard and do not pose a mass explosion risk. That means they can be transported on base without placards, reducing administrative burden, while still keeping safety controls in place through the written approval.

In contrast, other Hazard Divisions carry greater risks: 1.1 involves mass explosion hazards, 1.2 involves projection hazards, and 2.1 involves flammable gases. These require placards or other stringent labeling to communicate the danger to responders and personnel. So the correct option aligns with the idea that only HD 1.4 materials are eligible for such an on-base placard exemption with written commander approval.