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<p>used high-altitude observation balloons to monitor Soviet nuclear tests, while <a href="page.php?w=Project_Genetrix">Project Genetrix</a> used similar balloons to photograph the Soviet Union and China. Unlike previous observation balloons, these balloons were unmanned, ejecting their film to be <a href="page.php?w=Mid-air_retrieval"> recovered in midair</a> by specially modified aircraft. However, heavier-than-air craft now perform the vast majority of operations. <a href="page.php?w=Aerostats">Aerostats</a> were used by US and coalition military</p><p>
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