These requirements seem to apply mostly to "national security" payloads (e.g., spysats), so the exact nature of the requirements is classified. It's easy to co

These requirements seem to apply mostly to "national security" payloads (e.g., spysats), so the exact nature of the requirements is classified. It's easy to come up with a plausible guess about what the requirements might be (optics going out of alignment if you tip the spysat on its side?), but those who know don't say --- and those willing to venture a guess, like me, are showing they don't actually know.