by Renee Dudley

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The Defense Department has tightened cybersecurity requirements for tech companies that sell cloud computing services to the Pentagon.

The updates, issued this month, ban IT vendors from using China-based personnel to work on department computer systems and require companies to maintain a digital paper trail of maintenance performed by their foreign engineers.

The changes follow a ProPublica investigation that exposed how Microsoft used China-based engineers to maintain government computer systems for........

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