They didn't "turn it off" as much as set it very very low, maybe even to 0. But even then, military grade receivers still enjoyed 1-2 magnitudes of improved acc

They didn't "turn it off" as much as set it very very low, maybe even to 0. But even then, military grade receivers still enjoyed 1-2 magnitudes of improved accuracy. Clinton turned it off after surveyors figured out differential GPS, which essentially made it obsolete.