The Coast Guard’s primary role is in domestic law enforcement and maritime patrol. The Navy’s role is in national defense. In other words, the Navy (and the Marines) are a military force whose primary purpose is to be deployed to military operations abroad.
The Navy isn’t going to send a missile cruiser to patrol for drug traffickers and the Coast Guard isn’t going to send an aircraft carrier to the Persian Gulf.
While other countries might combine their operations into a single maritime force, the scale of the US military allows it to be more specialised in its operations while also providing the resources for each branch to maintain self-sufficiency. A common fact that shows this is that the second largest air force in the world… is the US Navy.
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