When parking standard transmission vehicles on the airfield, the gear should be left in which position?

Answer: C — Reverse

When parking standard transmission vehicles on the airfield, leaving the gear in reverse is important for safety and security. Positioning the gear in reverse ensures that the vehicle's weight and engine compression help prevent it from rolling away. This is especially crucial in an airfield environment where the risk of accidents can be heightened due to the movement of aircraft and other vehicles. In addition, by selecting reverse, it serves as a clear indication to anyone who might approach the vehicle that it is parked and secured. If the vehicle were in neutral, it could easily roll, leading to potential hazards. Parking in first gear also provides some level of security but is less commonly used in standard practice than reverse in certain situations. Overall, placing a standard transmission vehicle in reverse when parked aligns with established safety protocols to ensure both the vehicle and surrounding area remain secure.