Why Coast Guard deployment cannot cover every presence mission

Isn't the United States already deploying Coast Guard vessels overseas?

Yes, but limited cutter numbers and home-region duties restrict overseas capacity. The case for Navy patrol ships also assigns naval diplomacy and freedom-of-navigation exercises to the Navy.

Overseas Coast Guard deployment already occurs, but available ship numbers limit its reach. Anti-drug patrols in the Caribbean and off the American coast, including operations against narco-submersibles, compete with deployment to the Philippines. A cutter committed to those duties cannot be present in both places. The case for Navy patrol vessels also rests on treating international naval relations and freedom-of-navigation exercises as Navy responsibilities.