Who confirms that all necessary equipment is available for sampling?

The correct choice is the Assistant Sampler Collector, as this role typically includes responsibilities related to the preparation and verification of sampling equipment before operations commence. The Assistant Sampler Collector ensures that all necessary tools and equipment for sample collection are present, functional, and meet the standards required for effective sampling in CBRN reconnaissance operations. This attention to detail is crucial for maintaining the integrity of the sampling process and ensuring accurate data collection.

While other roles may contribute to the operation's overall efficiency and oversight, the primary focus of confirming equipment availability falls within the specific duties of the Assistant Sampler Collector. This role directly supports the lead sampler by preparing for and facilitating the sampling efforts effectively, which is an essential component of successful reconnaissance missions.