Due to the fact that the Coast Guard is part of Homeland Security and not Department of Defense, the Coast Guard also has the authority to perform Law Enforcement boardings on the high seas and in waters under US Jurisdiction. This is based on Title 14 USC Section 89. Performing boardings would be an “act of war” if done by the other maritime branches. On many Navy and Marine ships there is usually a Coast Guard team onboard that performs such boardings on vessels.
Source: Prior Coastie
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