Who is authorized to order the application of FireIce units?

The correct answer indicates that only a chief officer has the authority to order the application of FireIce units. This is crucial because chief officers hold a higher level of responsibility and decision-making power during emergency incidents. They have the training and situational awareness to assess the complexities of a particular fire scenario and determine the most effective suppression methods.

By delegating this critical decision to chief officers, the fire department ensures that the application of advanced fire suppression techniques, like those involving FireIce, is conducted under the supervision of experienced personnel who can weigh the risks and benefits appropriately. This hierarchy maintains a level of accountability and operational efficiency during emergencies, ensuring that the unique characteristics and requirements of each incident are considered before utilizing specialized materials like FireIce.

In contrast, the other choices involve individuals who may not possess the necessary authority or comprehensive understanding of the FireIce units' application, which could lead to inconsistent use or safety concerns.