Which shade is used for the wheel cap?

The choice of Air Force Blue Shade 1625 as the correct answer is based on its specific application for wheel caps. This shade is tailored for use in military vehicles and equipment, ensuring that the wheel caps not only meet aesthetic standards but also adhere to uniform specifications for operational purposes.

In military contexts, color codes are crucial for maintaining consistency and identification across various components. Shade 1625 has been established as the standard for wheel caps, which helps in distinguishing them within a broader set of military equipment while also providing the necessary camouflage or identification features required in field operations.

The other options, while they may be similar in hue, do not meet the specific requirements for wheel cap applications. Each shade is designated for particular uses, and using the correct shade is essential for functionality and compliance with regulatory standards in military contexts.