The Militia is the only real law-enforcement organization in San Andreas. It currently operates around the Fort Carson area, and Montgomery, which are the two most largest (and currently it is thought the only) safe heavens for survivors. The Militia arms itself with all it can find, and modifies vehicles for skirmishing.
The Militia also raids El Quebrados, to stop the inflow of the disease. The Militia also patrols the highways, and sometimes the water, to allow free flow of goods between the towns for the traders, whom they are on friendly terms.
The Militia co-operates with the local governments, and is divided into two precincts. The Ft.Carson precinct, and the Montgomery precinct is lead by a Commander, and the entire Militia is lead by a Superintendent.