Call it a reusable space vehicle. Call it a space plane. But whatever you do, just don’t call it a space weapon.

That’s the message from the Air Force after last week’s launch of its X-37B Orbital Test Vehicle, which can stay on orbit up to 270 days. The Air Force won’t say what, exactly, the robotic space plane will be doing there, how long it will linger this time, or even how much it costs. But the military is already in the process of building a second aircraft, which will fly next year.

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