Board Thread:General Discussion/@comment-122.135.62.246-20140314111723/@comment-1672596-20140314112826

Most likely basic mercenary work. They definitely did some mercenary work with those Outer Ops, and its implied that they've done at least one mercenary job prior to being hired by Galvez and Paz. Plus, if they could afford those boats, bikes, jeeps, guns, and stun rods (many of which aren't exactly commonplace or even well known), all prior to meeting Galvez, I'm pretty sure they can afford paying any new recruits.

And yeah, pretty much 15 prior to being hired by Galvez and Paz.