What are brief informal written records used to refresh an officer's memory known as?

The term referring to brief informal written records utilized to refresh an officer's memory is "notes." These notes are typically concise and may include vital details that can aid an officer during subsequent report writing or in recalling specifics about an incident. Notes are particularly useful in fast-paced environments where immediate recall of events and observations may be challenging. They ensure that important information is captured quickly and accurately, allowing for clarity and consistency in formal documentation later on.

Reports, logs, and records serve different purposes; reports are structured documents that provide a detailed account of events, logs are chronological entries of occurrences or activities, and records can encompass a variety of documents and data retention. Therefore, "notes" is the most accurate choice for the described function of refreshing memory.