Operation Doorstep

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Operation Doorstep was a Civil Defense test done in conjunction with the March 17, 1953, 16-kiloton ANNIE test conducted at the Nevada Test Site, part of Operation Upshot-Knothole.

In Operation Doorstep, blast and thermal effects were evaluated on mannequins, automobiles, and wooden frame houses. Testing of simple basement shelters and complex underground, reinforced-concrete shelters was done.

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