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“Was there a lack of leadership?” he said. “I am sure we will find people who didn’t do their jobs.”

But he observed that many mitigation measures had been taken, including barring downloads to removable media, like the CDs Pfc. Manning boasted of using to steal the data, and improved management oversight.

Mr. Rogers, however, was more skeptical. “I am not convinced that the problems are fixed,” he said. “If they are, they haven’t demonstrated that.”