What type of security posture does MARSEC 3 represent?

MARSEC 3 represents the Coast Guard's most focused security posture, indicating a heightened level of security response to address significant threats. Under this posture, security measures are intensified, and a high degree of vigilance is maintained. This includes increased coordination with law enforcement and other agencies, expanded maritime patrols, and implementation of strict access controls at maritime facilities.

The rationale behind this heightened posture is to proactively prevent potential security breaches or terrorist activities that could impact maritime operations or national security. While increased security measures and routine checks are components of the broader approach to maritime security, MARSEC 3 specifically denotes an escalated response tailored to address imminent threats, rather than routine operations or minimal efforts.