Prior military FOIA disclosures about specific incidents did not generically waive withholding about similar incidents; the waiver doctrine requires that the waiving disclosure be identical in both specificity and matter, and different incidents are inherently different matters.
Although the military cannot, under a mosaic theory, withhold disclosures of large amounts of data, but the disclosure is justified where the military contends that each element of the mosaic (each disclosure) might provide information about critical vulnerabilities.