Mamore
From Halopedia, the Halo wiki
Mamore is a UNSC colony world.[1] It is one of the few UNSC worlds that haven't been glassed. It is a highly unstable world, apparently very rough and hostile, especially toward the UNSC.
In 2537, there was an insurrection on Mamore, which was quickly and effectively put down by Spartan-III Alpha Company.
Being sent to the Mamore colony is mentioned as a threat to a soldier to get him to believe Rani's story during the raid on Chawla Base when they're trying to find and turn off the Deep-Space Artifact. Also mentioned during the raid is that there is some type of social group called the Kelorists[2] who are all from Mamore. The group has unique tattoo, a cross in the circle, that they use as a symbol of their association as a Kelorist.
Paritial Transcript of Treason.wav
Private: Excuse me, this entire building including the clean-room observation bay is strictly red badge and up-- Rani: --Security sweep! I'm going to have to ask you all to clear the building. Private: But the standing orders-- Rani: --Sorry, orders. Private: Well, I've got to see some identifi-- Rani: --Private! Dorking - if you want to go back to what ever mud filled life you had on Mamore, you can stay in my face! Private: Ma'am? Rani: Do you know what the penalty is for chewing pickup sticks on duty, private? Private: Pickup sticks? I never ch-- Rani: In the barracks, it's only a misdemeanor. But as soon as you walk through the front door of a level 5 security zone, it became treason! Did you know that private?! Private: Treason?
Paritial Transcript of security_sweep.wav
Jan: Did Durga give you the Mamore thing? Rani: Didn't you see his tattoo? That cross in the circle, he's a Kelorist. They all come from Mamore.