I'm sure you've explained this before, but are "security forces" the police, the military, both, or what?
Mostly police and there's lot of different kinds, like the old myth about Eskimo words for snow. The ones in white are traffic/street corner police. The ones in blue are also police, and are involved in mostly traffic but also some crime/security stuff.
The main forces you see are the Central Security Forces (CSF) who wear all black and have the riot gear. They're more like military police.
There's a few others, but I'm not sure what the distinctions are. There's also the plain clothes police, called "National Security." They're like our FBI, but really more like the Stasi. They're the ones that make people disappear.
The ones in camo are the military. They've been largely just standing back and observing and only stepping in during certain moments.