What is the classification of a new document stating an exercise will occur from 4 May to 25 May based on the classified source?

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The classification of the new document stating that an exercise will occur from 4 May to 25 May would be classified as "Secret." This indicates that the information within the document is sensitive enough that unauthorized disclosure could cause serious damage to national security. The context suggests that the details of the exercise, including its timeframe, arise from a classified source. Since the original source is classified, any information derived from it—including new documents about related activities—also retains a classification level that reflects the sensitivity of the source.

In this case, even though the document talks about specific dates, the connection to classified information elevates its classification. The classification would not be "Confidential" or "Unclassified" because those levels denote less sensitive information or information that does not require protection. "Classified" alone could be seen as vague without a specified level. Therefore, "Secret" is the most appropriate classification for this document since it accurately represents the level of concern regarding unauthorized disclosure of the exercise details derived from the initial classified source.