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Triangle Eye, Nevada Test and Training Range, Nevada
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Triangle Eye is within the Nevada Test and Training Range. The area is closed off to the general public so probably only see it from the air.
These are artillery firing targets meant for "Circular Error Probable" and Time on Target related calibrations and training. During WW1 and WW2, it was found that most artillery kills happen within seconds of the attack starting, because once the artillery has started to impact, the soldiers are quickly rushing for cover. Because of this, artillery soldiers found that the best way to get optimal impact from artillery was to ensure that all shells landed roughly in the same area and at the same time, like a high-powered shotgun blast. These circles are used to determine how closely grouped the shells are, and because the ground is completely flat, it also allows for easy monitoring of the impacts to verify how close they are in time. If you look over the hills to the west, there is a similar circle that has more obvious impact markings. The circles are roughly 100 meters apart so it's easy to gauge how many shells land within 100 meters of the target.
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