Which training is least likely required for specialized airside vehicles?

First aid training is typically focused on health and emergency response skills rather than the operational, technical, or maintenance aspects of specialized airside vehicles. While first aid is important for overall safety, it does not directly relate to the specific functionalities or operational procedures required for specialized vehicles used in an airport setting.

In contrast, the other options—operations for refueling trucks, driving techniques for baggage tugs, and guidelines for vehicle maintenance—are directly related to the safety and efficiency of operating specialized vehicles on the airside. Training in these areas ensures that operators are equipped with the necessary skills to handle the vehicles appropriately, manage their specific functions, and understand maintenance requirements to promote operational safety and vehicle longevity.