Which command would you give to the crew when requiring additional personnel for ground support?

The command indicating that a wingwalker is requested is the most appropriate choice in this context. A wingwalker plays a crucial role in ground operations, particularly for ensuring safe maneuvering of the aircraft. This position involves a designated crewmember who assists in guiding the aircraft during taxiing or while backing up, helping to maintain clearances from obstacles and ensuring visibility for the pilots.

When additional personnel are needed for ground support, calling for a wingwalker signifies a specific task that requires immediate attention and coordination among the ground crew. This command communicates not only the need for extra safety measures but also helps to organize the ground operations effectively.

In contrast, the other commands listed serve different functions. Removing chocks is related to the aircraft's movement, while "ready to depart or ready to tow" indicates preparedness for departure but does not specifically address the requirement for additional personnel. Similarly, "engine running" pertains to engine operations and suggests that the aircraft is about to start its engines, which is not directly related to the need for ground support personnel.