What is NOT a duty of Service Support USNS ships?

The choice indicating that conducting oceanographic research is not a duty of Service Support USNS ships is correct because Service Support ships primarily focus on logistical and operational support missions, rather than scientific research initiatives. These vessels are primarily designed to provide fleet support, including transportation of personnel and equipment, fueling operations, and other forms of logistical support. While oceanographic research is essential within the Navy and may be conducted by other specialized vessels, it falls outside the typical responsibilities of Service Support vessels, which are more focused on ensuring that operational fleets are supplied and supported during missions.

Towing and rescue operations, submarine support, and cable laying activities are all within the mission profile of service support ships, as they contribute directly to enhancing the operational capabilities of naval forces.