Which term is used for the procedure when firefighters are assigned to higher duties?

The procedure in which firefighters are assigned to higher duties is known as "Acting Pay." When a firefighter is required to perform the responsibilities of a higher rank, they receive additional compensation for taking on these increased duties. This compensation reflects the greater responsibility and the skills required for the role they are temporarily fulfilling.

Temporary Promotion refers to a formal change in rank, while Overtime Duty typically involves working hours beyond regular shifts without the specific designation of a higher rank. Standby Duty generally refers to being available for call-outs but does not imply that the firefighter is actively performing higher duties. In the context of this question, "Acting Pay" correctly describes the procedure and compensation for those who step into higher-ranking roles temporarily.