What flag should be flown when there is a general recall of all personnel?

The flag that should be flown during a general recall of all personnel is the Papa flag. In naval communications, specific flags have established meanings as part of the International Code of Signals. The "Papa" flag is used to indicate "All personnel return to ship" or a general recall, signaling that all members are to assemble back at their duty station or to the ship promptly. This clear and explicit signal ensures that personnel understand the urgency and importance of returning, especially in critical scenarios.

The other flags—Alpha, Bravo, and Charlie—each represent different messages in maritime communication. Alpha typically signals "divers down" and is primarily related to underwater operations. Bravo indicates the presence of flammable materials or dangerous cargo. Charlie signifies "affirmative" or "yes." These flags serve specific purposes that do not correlate with the call for a general recall, hence they are not suitable for this situation.