What should you do when given permission after presenting your ID while leaving your ship in uniform?

When you are given permission to leave your ship while in uniform, stepping onto the bow and facing aft represents a proper naval custom that shows respect and adherence to military protocol. By doing this, you position yourself in a way that acknowledges the ship and its command as you prepare to depart. This act is symbolic of showing respect for the ship itself and is a part of the ceremonial behaviors expected of personnel in uniform.

The other options, while related to naval customs, do not capture the specific action of leaving the ship in a formal and respectful manner. For instance, saluting the ensign is commonly done when reporting for duty or as a sign of respect to the flag but does not specifically pertain to the exit procedure. Similarly, requesting permission or returning to the quarterdeck may involve additional formalities that are not strictly the act of leaving the ship itself.