What does PSU stand for in coastal riverine operations?

In the context of coastal riverine operations, PSU stands for Port Security Unit. These units are specifically established to protect critical ports and waterways, ensuring safe and secure maritime operations. They are equipped and trained to address various threats and provide security in maritime environments, which is vital for maintaining the safety of shipping lanes and protecting infrastructure against potential incidents, including terrorism or smuggling. The focus of Port Security Units on safeguarding strategic maritime locations aligns with the primary objectives of coastal riverine operations, making this choice the most accurate in the given context.