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The Afghan command also wants a list of all IP addresses outside the network that require access to D-Sigs’ large collection of intelligence data.

The memo obtained by The Times does not say whether D-Sigs has, in fact, been hacked or sustained a security breach.

“DCGS-A continues to have repeated security failures. … DCGS-A currently can’t comply with DoD security regulations which is unfortunately increasing the chances that classified information may be compromised,” an Army intelligence analyst who requested anonymity to freely discuss security matters said in an email. “In my estimation, security breaches are more likely to occur because DCGS-A is not capable of providing computers that work or producing an audit trail.

“There were multiple DCGS work stations that crashed and they were always replaced with a laptop that was just as bad. It’s troubling to comprehend the lack of what DCGS-A provides to soldiers and how much it has cost the U.S. taxpayer.”

Members of the Army’s top brass steadfastly have defended D-Sigs, which has been in the works for more than a decade, as a giant leap in battlefield intelligence collection. It has presented to the media soldiers who operate D-Sigs and say it works great.

Its top defender is Gen. Raymond T. Odierno, Army chief of staff, who got into a spirited public debate with Mr. Hunter at a budget hearing this year.

“We have more capability today in our intelligence than we’ve ever had,” the general said. “I can go to 30 places that tell me [D-Sigs] is working tremendously. Is it perfect? No.”