Mamorian Riflemen's Association

The Mamorian Riflemen's Association, known sometimes more simply as the Riflemen, was ostensibly a civilian self-defense and recreational group formed on the planet of . However, the Association was formed with an ulterior motive in mind, particularly turning those who became part of it to the cause of the , and training them as soldiers of the nascent Mamorian Insurgent Army, the successor to the units that had been dismantled by in . 
The Association was initially formed in 2539, officially chartered as a frontier organization dedicated to training colonists to defend themselves against bandits and to provide recreation to teenaged and college-aged Mamorians to ensure they had something to do so they would not be dragged into the criminal world. While the forces and were suspicious of training colonists to defend against bandits for fear that same training would be used against the UNSC, they still permitted the Association to operate. 
However, underlying its ostensibly altruistic purpose, the Association was intended to bring in new recruits for MIA. Through subtle means such as disintegrating pamphlets and conversations between members, many of the Association's members, young and old, began to harbor rebel sympathies, and eventually, some went so far as to enlist in the MIA as soldiers. After little over a decade, this was found out, and the colonial government shut down the Association, sending UNSC troops and law enforcement to apprehend the leaders of the group. While many pro-rebel members died during the ensuing gunfight, some slipped away, returning to their regular lives, or becoming sharpshooters and instructors for new MIA recruits.