Welcome to Halo Answers. What would you like to know?

The Military Police helmet can be acquired through Halo Waypoint by completing the campaign on Normal difficulty (I think). The ODST helmet can be acquired after purchasing it. I don't know at what rank they unlock or how much it costs.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.