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Keywords: NTS - Balloons Launch Site.jpg Nevada Test Site Frenchman Flat <br /> This reinforced concrete structure was used to hoist nuclear devices attached to helium-filled balloons The balloons were capable of lifting upwards of two-and- a-half tons to an altitude of 1 500 feet Nevada Test Site Guide http //www nv energy gov/library/publications/historical/DOENV_715_Rev1 pdf DOE/NV-715 Federal Government of the United States PD-USGov Frenchman Flat |