Unsealed: Alien Files Season 4 Episode 4S4E4 The Space Force
Air Date: Thursday May 19, 2016 on Destination America.
Episode avg rating: 8.1*.
Source: YouTube (free)
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Since the early 1960s, we've experimented with how to travel off planet Earth. Many experts believe America has operated a secret Space Force for decades, with ultra high-tech ships designed for missions beyond Earth's orbit.