Which unit's primary function is to transport personnel and supplies for carrier onboard delivery?

The unit that primarily focuses on transporting personnel and supplies for carrier onboard delivery is indeed the VRC, or Carrier Onboard Delivery squadron. These squadrons are specifically designed to operate aircraft that can take off and land on aircraft carriers, facilitating the transfer of goods and personnel between the ship and land bases or among ships at sea.

VRC units typically utilize aircraft such as the C-2 Greyhound, which is optimized for this type of transport mission. They play a crucial role in supporting carrier strike groups by ensuring that the carrier is supplied with necessary resources and personnel efficiently, contributing to the operational readiness of the fleet.

In contrast, the other units mentioned have different missions. For example, VAW (Airborne Early Warning) squadrons focus on airborne surveillance and command and control, VT (Training) squadrons are primarily involved in pilot training, and VFA (Strike Fighter) squadrons conduct attack missions with strike-fighter aircraft. Each of these units has distinct roles that do not revolve around the dedicated mission of transportation for carrier onboard delivery.