Maritime Security Response Team

The Maritime Security Response Team (MSRT) is a specialized tactical unit of the United States Coast Guard and forms part of the Deployable Specialized Forces. It is a globally deployable unit specializing in high-risk boarding, direct action variability (ranging from close-quarters combat to precision marksmanship), helicopter insertion, advanced maritime interdiction, and response to CBRNE threats (chemical, biological, radiological, nuclear, explosive).

Source: Wikipedia — Maritime Security Response Team (CC BY-SA 4.0)