If you can get to Mars then the US military can certainly do so. The government would certainly deploy some power structures (police force and/or soldiers) on Mars once a sizeable colony is built there (let's say couple hundred colonists that can self sustain themselves). To keep order and enforce laws and potentially, if the colony grows enough to have a functioning economy, to collect taxes.
It appears you are setting yourself up to a series of sound disproofs, such as having to point out how communities with purpose without the damaging effects of power dynamics are more efficient, intelligent and effective.
- "Political power grows out of the barrel of a gun"