[quote=The Fated Fallen]
I like that last idea, I might try being a marine already in the city. I could even be associated with the objective the ODST's are heading for
[/quote]

Well, the presence on Mars was mostly what was left of the Army, actually.
-Of note is they tend to keep the pre-covenant standard .30 caliber firearms. And usually gets issued complete shit, such as a rifle that is literally 120 years old.

OTOH, being that Misrah is on-planet, and has ramped-up production, I'd suggest letting Army-NCOs use [url=http://halo.wikia.com/wiki/M395_Designated_Marksman_Rifle]Halo[/url] [url=http://halo.wikia.com/wiki/BR85HB_SR_Battle_Rifle]4[/url] [url=http://halo.wikia.com/wiki/BR85HB_SR_Battle_Rifle]weapons[/url].

Of note, the army MA37 assault rifle is notoriously THE WORST assault-rifle in the Halo-verse, while the MA5D is actually rather decent.