Why the hazmat suits?
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Hypergolic fuels
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I like how how the ground crew on the tarmac are in their everyday uniforms but the services crew is wearing what I can only image are the same suits that would be worn during a first-contact event.pic.twitter.com/SSNNqKLpUb
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I saw a lot of people asking whether this was a crewed vehicle, I imagine some of that confusion was related to the ground crew wearing the SCAPE suits. The X-37B uses hypergols so the suits make sense in that regard.
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They need two guys & measure with a distance wheel to place cones?. Space is expensive.
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I bet it'd be worthwhile for the USAF to keep putting the X-37B up there, just to keep everyone guessing what it is doing .
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It is
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Interior should be protected from heating. Fungi and bacteria known to grow and mutate on ISS. Abundance of caution (and something dramatic which looks a bit like a space suit, for extra style points.)
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Wait... Boeing makes winged objects that can stay off the ground?!?!

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