U.S. Army personnel may be training for cyberwar, but their own web browsing is quietly feeding the surveillance economy.

According to a recent study by the Army Cyber Institute at West Point, corporate surveillance has deeply infiltrated the U.S. Army’s unclassified IT infrastructure in the continental United States. The researchers—who declined an interview request, citing increased scrutiny of external engagements by the Department of Defense—analyzed the 1,000 most frequently requested internet resources on Army networks over a two-month period and found that 21.2% were “tracker domains.”

Those domains exist solely to harvest user data and........

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