FILE 11621 of 43151

Cold War Satellite Calibration Marker

Casa Grande, Arizona - One of 256 satellite calibration markers placed in the Arizona desert by the U.S. Air Force and the Central Intelligence Agency during the Cold War. The concrete markers helped calibrate spy satellites to take pictures over Russia and China from 1959 to 1972.

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Filename:	az-0584-d.jpg
Image Description:	Casa Grande, Arizona - One of 256 satellite calibration markers placed in the Arizona desert by the U.S. Air Force and the Central Intelligence Agency during the Cold War. The concrete markers helped calibrate spy satellites to take pictures over Russia and China from 1959 to 1972.
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