Which of the following is not a requirement for operating vehicles on the airfield?

Answer: B — Submitting a flight plan

Submitting a flight plan is not a requirement for operating vehicles on the airfield. Flight plans are specifically associated with aircraft operations, as they provide information about the intended route and duration of flight, ensuring safety in the airspace. While vehicle operators must be aware of their surroundings and the airfield environment, they do not need to submit a flight plan like pilots do. In contrast, knowledge of the airfield layout is essential for navigating safely, completing Foreign Object Debris (FOD) checks is critical to prevent damage to aircraft, and being aware of aircraft movements enhances situational awareness, all of which are vital for ensuring safety on the airfield.