Final answer:
A sergeant is required to submit a report to the chief of police when certain milestones or events involving a probationary officer occur.
Step-by-step explanation:
A sergeant is required to submit a report to the chief of police in several specific situations:
- When a probationary officer is involved in an incident.
- When a probationary officer completes their probationary period.
- When a probationary officer receives a promotion.
- When a probationary officer is absent from duty.
These are important milestones and events in the career of a probationary officer that warrant reporting to the chief of police.