[...] It was a bit after 3 p.m. on Thursday, April 17, 1952, and 13 Soldiers were in the midst of a field familiarization hike three miles south of Yuma Test Station, near what today is a vehicle mud course. ... Suddenly, they saw almost directly overhead a flat-white circular object heading toward the mountain-lined southeastern horizon, emitting an intermittent vapor trail. About a quarter inch wide when judged at arm’s length from the ground, the object disappeared within seven seconds.
[...]
At the time, the Yuma Test Station headquarters staff relayed information of the sighting to their superior command, the Sixth Army, who in turn forwarded it to Wright-Patterson Air Force Base. [...]
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