Final answer:
Official Military Personnel Files are updated after significant events such as a promotion, which represents a change in rank, pay grade, and responsibilities for a service member.
Step-by-step explanation:
Official Military Personnel Files (OMPF) are typically updated following specific events in a service member's career to ensure all records are current. Among the options provided, the event that would trigger an update to the OMPF is a promotion. When a service member gets promoted, their rank, pay grade, and responsibilities change, which needs to be reflected in their official records. As such, the OMPF must be updated to accurately document this career progression.
Other significant events that might also lead to an update of these records include deployments, courses completed, awards and decorations received, changes in duty assignments, and discharge or retirement from the military