Who has the authority to set and adjust the MARSEC levels?

The authority to set and adjust the Marine Security (MARSEC) levels lies with the Commandant of the Coast Guard. This position holds the responsibility for maintaining safety and security in U.S. waters and is equipped with the necessary authority to make decisions regarding MARSEC levels based on threats or intelligence assessments.

The MARSEC levels are crucial for baseline security measures, and the Commandant can change these levels in response to varying threat conditions to better protect ports, vessels, and maritime infrastructure. This authority is established under the Maritime Transportation Security Act and is designed to provide a structured approach to ensuring maritime security.

Other positions, such as the President or the Secretary of Defense, have broader responsibilities and authority over national security matters but do not directly manage day-to-day maritime security operations and decisions. The Coast Guard Sector Chief oversees operations at a local level and implements policies but does not have the authority to set national MARSEC levels. Thus, the command structure ensures that the Commandant has the specific authority necessary to react to threats effectively and maintain security within the maritime domain.