What is NOT one of the primary functions of the Coast Guard?

The control of air space is not one of the primary functions of the Coast Guard. The Coast Guard's mission primarily revolves around maritime duties, including law enforcement, environmental protection, and safety at sea. Its operations are focused on ensuring the safety and security of U.S. waters and the maritime environment.

The Coast Guard is actively involved in drug interdiction, which addresses the illegal trafficking of drugs by sea. Marine environmental protection is another critical function, aimed at preventing pollution and preserving marine ecosystems. Additionally, search and rescue operations are a vital responsibility of the Coast Guard, as they respond to emergencies at sea to save lives.

In contrast, control of air space falls primarily under the domain of the Federal Aviation Administration (FAA) and the military. The Coast Guard does not have the authority or training required for managing air traffic as it focuses on maritime operations.