The standard issue Navy 9mm pistol can operate in which firing modes?

The standard issue Navy 9mm pistol operates in both single and double action firing modes, which is why this is the correct answer.

In double action mode, the shooter can pull the trigger to both cock the hammer and fire the pistol in a single motion. This feature adds a level of safety, as the longer trigger pull reduces the likelihood of an unintentional discharge.

In single action mode, the hammer must be cocked manually (or automatically with the first round), allowing the trigger to release the already cocked hammer for a more sensitive and shorter trigger pull. This provides increased accuracy for subsequent shots after the initial trigger pull.

This versatility of operating in both modes allows users to adapt their shooting technique based on the situation, enhancing their effectiveness and control during use. Other options do not account for this combination, leading them to be incorrect.