Forum:Samus's Employment

I know that at one point Samus was working for the galactic federation, and that she was trained by them. I also know that she resigned, possibly because of Adam Malkovich's death, which leaves me wondering when that incident happened. It must have been after Zero Mission, because that was, well, her first mission. In Fusion it is explicitly stated that she no longer works for the federation and she is being privately hired. Somewhere between the two she quit, but all the missions seem the same in terms of being hired privately or sent from within the federation.