National Security Cutter

the sixth Legend-class cutter of the United States Coast Guard.

In the early 2000s the United States Coast Guard, decided to replace all its largest Cutters with vessels very similar to modern Naval frigates, called the National Security Cutter. This replacement was part of a plan, called Operation Deepwater, that over decades, would have replaced all the Coast Guard's existing Cutters with more modern vessels.

The United States Navy had plans to introduce new frigates, called the Constellation class, only to decide, after spending years and a large sum of money, adapting a European designed frigate, to cancel that design. Their design, based on the European design, had grown too complicated, too large, and differed too much from its base design. Instead, the Navy would rapidly introduce a more modest design, based on an existing US design, and so the Navy was going to introduce frigates based on the Coast Guard's National Security Cutter.

In late 2025 and early 2026, the National Security Cutter USCGC Munro was called upon to play the lead role in the capture of the rogue supertanker Marinera.

Some commenters, nothing that the flawless tracking, boarding and capture of the Marinera, by a National Security Cutter, would suggest it was capable of serving in the Navy.