Which of the following is NOT a segment search tactic?

The concept of search tactics in the context of search and rescue operations involves various strategies employed to efficiently locate missing persons. Among the options listed, "confinement" is not considered a segment search tactic.

Segment search tactics typically involve dividing the search area into manageable segments and methodically searching each segment. The expanding circle tactic involves starting from a central point and progressively searching outward in a circular pattern; this is effective for locating someone close to a known point. The sound sweep method uses auditory signals to draw the attention of the missing person, helping to guide searchers effectively. A tight grid search involves creating a grid pattern where searchers either walk through or cover a specific area in a systematic manner, ensuring thorough coverage.

In contrast, while confinement can refer to a strategy of limiting the area in which a search is conducted, it does not involve the sequential, organized methodology that characterizes segment search tactics. Therefore, the correct answer identifies "confinement" as not being a recognized segment search tactic.