Who is responsible for weapons handling in Undersea Warfare?

The Combat Systems Officer is primarily responsible for weapons handling in Undersea Warfare. This role encompasses overseeing the operational readiness and effective use of all weapon systems on board. The Combat Systems Officer must ensure that the crew is adequately trained in weapons handling procedures, maintain inventory of munitions, and conduct regular inspections and training exercises related to weapon systems.

In the context of Undersea Warfare, the Combat Systems Officer will coordinate the integration of various systems that engage threats, manage the tactical employment of weaponry, and ensure compliance with safety protocols during operations. This officer must also be adept in the tactical use of weapons in diverse scenarios, making them integral to the success of the mission.

Other roles, while crucial in their respective areas, do not hold the primary responsibility for weapon handling. The Assistant Weapons Officer typically assists the Combat Systems Officer but does not hold the overall responsibility. The Quality Assurance Officer focuses on verifying that systems meet specified standards and requirements, while the Navigation Officer primarily manages the ship's navigation and not the weapons systems. Thus, recognizing the Combat Systems Officer's pivotal role clarifies why this choice is the most fitting answer.