Which of the following abbreviations stands for the aviation service entry date?

The abbreviation that stands for the aviation service entry date is indeed AS. This term is used within naval and aviation contexts to denote the specific date when a service member officially enters aviation service. Understanding this abbreviation is essential for tracking service records, benefits, and progression within military aviation careers. The other options do not correspond to aviation service entry date: HP could refer to a different term entirely, CP often relates to critical points or capacities in different contexts, and SS is typically associated with submarines or enlisted ranks. By grasping the significance of AS, service members and personnel can better navigate their careers and official documentation relating to aviation service.