Most western countries and democracies in general base their government on the premise that the military is completely subordinate to the civilian government, and can only act against it when that civilian government undeniably violates the fundamental governing laws of the country.
This system is not the norm everywhere. Some countries instead hold the military as a check on executive power- where the military is empowered to act against the ruling government if deemed fit. In this case, all you need is a majority of military commanders to support acting against the executive branch in order to execute a coup.
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