Which branch's roles focus on maritime security and sea control?

The Navy's primary roles revolve around maritime security and sea control, making it the correct answer. The Navy is tasked with maintaining freedom of navigation and ensuring the safe passage of vessels in international waters. Its capabilities include surface ships, submarines, and naval aviation, all of which work together to project power, deter aggression, and respond to threats at sea.

Maritime security encompasses a broad range of operations, including safeguarding vital sea routes from piracy, smuggling, and other illegal activities. Sea control is essential for the Navy to help secure areas of interest and to assure allies of its commitment to mutual defense. The Navy's operations can also extend to power projection and amphibious assaults, wherein it supports ground forces and enables joint operations, further highlighting its critical role in maritime environments.

In contrast, other branches have different focuses. The Army is primarily ground-based and focuses on land operations; the Air Force manages aerial operations and air superiority, while the Coast Guard typically blends maritime safety, security, and law enforcement roles, often in peacetime or during domestic crises. Each branch plays a unique role in national defense, but the specific focus on maritime security and sea control distinctly aligns with the capabilities and mission of the Navy.