You've been granted complete authority over the entirety of the U.S. government and militia for six hours starting now

You've been granted complete authority over the entirety of the U.S. government and militia for six hours starting now.

What do you do?

Hardmode: Don't make yourself supreme president for life or anything, once your six hours is up Obummer gets back in office and the U.S. government functions normally, but pertaining to what you've changed.

Declare the US is a communist country so that the greatest country in the world is communist again.

Sanction the immediate assassination of the top 62 wealthiest people in the world who own half of its wealth (most of which reside in the USA).

Kill Obama
Kill Clinton
Kill Trump
Kill everyone

Remove the electoral college system (and winner takes all), have a flash election immediately where the military under my direct command is to oversee every voting station (all machine voting systems will be removed), every governmental post up for grabs, supreme court justices included. Voting extended as a rights to all - including prisoners.

Not exactly a radical transformation, but there's not much good you could do in 6 hours other than at the very least trying to bring some honesty to elections. With all fraud removed, I'd imagine you'd see a big difference, and possibly at least give people something to work with.

Right now the clusterfuck which is the US ruling system is so bizarre it's not even workable.
I'd see a coup, militantly, as un workable as you said the government and militia (i.e I assume you mean the military); so ideologically they wouldn't be on my or the people's side, as their entire structure and ruling dogma would resist and stunt (or ultimately reverse, immediately after my 6 hours were up) any sort of massive overthrow.

Forcing elections to be honest, though… and having a snap election (regardless of turnout) for every post, would probably toss the whole thing for a spin. (for the better)

It'd probably actually be better to have a people's militia, and a massive organized movement with a socialist understanding; and not sit at the reigns of the US government. In that case, establish a parallell state and deem the current government as illegit and without mandate. You would need massive popular support, though.

Fire the nukes and then call up area 51

Declare all billionaires enemies of the state, completely oust the current republican government in favor of relative state control over individual issues. Draft a new constitution that abolishes private property rights and gives control over the means of production to the workers, reduce the state to a minimal democracy whose job is to deter invasion and handle foreign affairs, and bring all US military forces currently deployed in combat back.

Declare war on China and Russia already. Playing around gets tiresome

Diamante capitalism and abolish the state.

Amend the Constitution to:

1. ban all private campaign contributions and independent expenditures;
2. mandate equal public financing for all candidates and ballot measures;
3. require that any candidate who spends so much as one penny more than their public allotment is banned for life from that office;
4. state clearly that the rights and muh privileges bestowed by the Bill of Rights are only given to natural persons–in other words, corporations are not people and do not have the rights of people; and
5. mandate that anyone or any corporation that profits by breaking financial, labor, or environmental regulations will, upon conviction, forfeit three times that profit.