A training session scheduled as part of a regulator shift or due time period is known as a:

In this context, a training session that is integrated into a regular shift or planned time period is referred to as an in-service drill schedule. This type of scheduling is essential because it ensures that training is conducted consistently and is aligned with operational shifts, thus reinforcing the skills and knowledge necessary for personnel to perform their duties effectively.

In-service drill schedules are designed to provide ongoing training within the context of regular work routines. This fosters an environment where personnel can engage in practice while simultaneously fulfilling their job responsibilities, ultimately enhancing their readiness and competency.

The other options represent different aspects of training management. Supplemental training schedules typically refer to additional training provided outside of regular duties, while a master training schedule serves as a comprehensive overview of all training activities planned for an organization. Agency training needs encompass the overall training requirements identified by an agency but do not specifically refer to training tied directly to shifts or time periods.