Which of the following is NOT one of the nine basic fire service knots?

The sailor's knot is not considered one of the nine basic fire service knots. The nine basic knots that firefighters are typically trained to use are essential for various tasks, such as securing equipment, creating harnesses, and tying off lines in emergency situations.

The clove hitch, figure eight follow through, and bowline all serve important functional purposes within firefighting contexts. For instance, the clove hitch is often used for securing a rope to a post or another object, while the bowline creates a fixed loop at the end of a rope, useful for rescue operations. The figure eight follow through is also crucial for creating secure loops that can be easily untied after weight is applied.

Understanding these specific knots is vital for effective and safe firefighting practices, as they allow responders to handle ropes and lines confidently in various scenarios. Since the sailor's knot does not fall within this standard training curriculum for firefighters, it is correctly identified as not being one of the basic fire service knots.