All those who would have been removed from the ranks.
There is always a chance of a coup despite multiple purges. We have seen this before in totalitarian regimes throughout history. I would also argue that such a coup is more likely before a totalitarian regime has become entrenched with an effective police state, martial law and total media censorship. If the 0bama regime is seen as a sinking ship, opposition will form as a means of self preservation in the military, and action will follow.
You don’t necessarily need highly principled people to act, just those who sense an opportunity and have a survival instinct for themselves and their families.