Basically, it is what it says.
A private militia group that does your more private or disclosed jobs for you while being payed by you. They will go to extra lengths to do the task assigned and are all specially trained to get the job done.
All contractors are trained to handle weapons without stress and act in situations without mistake. They can use up to a wide range of vehicles, weapons, and electronics.
The RMC can complete any job tasked, whether it be an assassination of a high value target like the town mayor, or maybe something more personal like that guy who stalks or harasses your wife and kids.
This militia is only available to the people who need it, and can afford it.....