Microsoft’s augmented reality Hololens goggles are getting a rough ride in tests by the US Army, according to internal military evaluations seen by Bloomberg and Insider.

Soldiers testing the headsets have complained about their “mission-affecting physical impairments,” and say that wearing the goggles can cause headaches, nausea, and eyestrain. Acceptance of the tech “remains low,” says a summary prepared for Army and Defense Department officials and seen by Bloomberg, with soldiers complaining that the headsets don’t “contribute to their ability to complete their mission.”

One testimony reported by Insider was even blunter. “The devices would have gotten us killed,” said the tester — referring to the light emitted by the goggles’ head-up display, which could alert enemy troops to the wearer’s presence.

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