If push came to shove, would US Military enforce tyrannical rule of the State, or would they defend American Citizens against tyranny... Egyptian style?

Consider recent Egyptian events, and project that scenario on the US… The Egyptian Military ousts President Morsi and takes him into custody… Apparently by the majority will of the people.

This is not about whether you think it’s right or wrong. Though I would like your opinion on that. But what this question really asks… is if you think the US Military would support a tyrannical State, or defy the elected leadership and instead protect US Citizens from that tyranny.
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Do not answer this question with the ideals you have about the current state of the nation. You’d be missing the point.

Project the recent rebellion in Egypt upon the US, and answer the question from that future assumption. Who would the US Military defend if the Citizens rose up in mass rebellion, with a majority of people marching in street, refusing to work, demanding the ousting of the entire political body… Who would the Military stand behind?