Question

the lower right pocket of an auxiliary boat crew sar vest contains: knife, personal locator beacon, whistle and mirror, flare

Explanation:

In the context of an auxiliary boat crew SAR (Search and Rescue) vest, the lower right pocket typically contains a Whistle and Mirror. These are standard safety and signaling items for such vests, used for attracting attention and signaling in rescue situations. A knife is not typically in that specific pocket, a Personal Locator Beacon is usually in a different location or not in this pocket, and a flare also has its own designated storage in the vest setup.

Answer:

Whistle and Mirror