ONS, CNS, and MNS security officers are all in house or Duke employee's at least for now. They are non union. Cant tell you top out pay cause I do not know but I think you go from start to top out in around 5 years if you obtain all the required quals.
The Duke/Progress merger leaves a lot up in the air as to how many positions and pay will wind up from what I hear.
I don't think progress security is in house so you never know what the future will bring
sf