How is the classification determined for the new document that mentions “Unit members cannot attend training while conducting test firings?”

The determination of classification for the new document hinges on the concept of "revealed by." When creating a derivative classified document, one assesses whether the information it contains can be classified due to the nature and context of the details being disclosed.

In this case, the statement about "Unit members cannot attend training while conducting test firings" implies a specific operational context that may relate to ongoing classified activities or military operations. If the statement reveals information that, when correctly deduced, exposes sensitive or classified operations, then the overall classification of the document should align with that sensitivity.

The reasoning behind this determination involves analyzing whether the information could lead to inferences about capabilities, readiness, or strategic timings related to military functions. If the training schedules and test firings are sensitive topics, aspects around them are likely classified. This approach of examining how much the context or content reveals informally impacts how classification is assigned, thus justifying the choice "revealed by" as the correct answer.