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 M

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.