AHC: American Junta

What would it take for American military to take over the government of America post 1900?

This military Junta government can exist for any period of time whether that be a decade or a single week.

What events need to happen so that something like this could occur? Or is this flat out impossible without ASB intervention.
 
A nuclear first-strike by the USSR catches America with its pants down, and the continuity of government schemes fail to keep anyone in the cabinet alive, as well as most of Congress and the Supreme Court. The Joint Chiefs or the highest ranking military commander becomes the de-facto head of government because they are the commander in chief, and their first and last act is a counterstrike against the communist bloc before the war destroys the Northern hemisphere.
 
Maybe if the Business Plot leads to chaos which degenerates into a military dictatorship.

... in Washington, because the dinky US army will find the State governors and legislatures with their national guards giving their attempt at dictatorship a particular didget while assembling a temporary government somewhere safely away from The Big Red One's rifles.
 
Maybe some kind of plot during WWII that knocks out the Presidential line of succession*. It's just challenging because you have 50, or I guess 48 at this point, Governors and state legislatures that may have something to say about it. However, there could be some concerted effort during WWII to have a wartime junta and reestablish democratic governance after the victory, and then have more of a puppet sham-election that leaves the military in control.

*I'm not quite sure what the line of succession was before 1947
 
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