What message must be released by the ship at least 30 days before a port visit?

The message that must be released by the ship at least 30 days before a port visit is the Logistic Requirement, commonly known as LOGREQ. This message serves a crucial role in the logistics and planning process for a port visit. It outlines the ship's logistical needs, including personnel, supplies, and services required during the visit.

By submitting the LOGREQ at least 30 days in advance, it ensures that the necessary arrangements can be made by the appropriate forces and agencies at the port, allowing for smooth operations upon arrival. This advance notice is essential for coordinating with port authorities and securing the necessary services such as fueling, provisions, and maintenance support.

This proactive communication helps minimize delays and enables the ship to efficiently carry out its operational readiness and sustainment during the port visit.