The answer is yes, but only in an extreme case. There is normally no need for the military to play any role in an election. The Constitution keeps the military in a narrow lane — defending the United States from external enemies. Civil order is left largely to civilian police. But there is an obscure law, the Insurrection Act, that theoretically could thrust the active-duty military into a police-like role. And governors have the ability to use the National Guard in state emergencies if needed.
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Myself, I think if the military does get involved, it'll be only to protect infrastructure such as power plants, water pumping stations, airports, etc.
