According to Section II of DD Form 626, which items must be inspected and in proper working condition on a vehicle transporting ammunition?

The correct response highlights the importance of inspecting suspension and coupling devices on vehicles transporting ammunition. These components are critical for ensuring the stability and control of the vehicle during transport, especially given the potential hazards associated with carrying explosives or munitions. A properly functioning suspension system ensures that the vehicle can handle the weight and distribute it evenly, enhancing safety and reducing the risk of accidents.

This choice emphasizes the specific needs of transporting hazardous materials where vehicle performance and integrity are paramount. By ensuring that suspension and coupling devices are in proper working condition, the likelihood of mishaps during transport is significantly minimized, thereby safeguarding both the operator and the cargo.

While the other options address important aspects of vehicle functionality and safety, they pertain to general vehicle operation rather than the specific requirements outlined in Section II of DD Form 626 for vehicles handling ammunition transportation. Proper brake lights and turn signals, tires, and windshield wipers are essential for road safety, and interior cleanliness, while relevant for operational standards, does not focus on the critical systems necessary for transporting potentially dangerous materials safely.