He kept getting transferred because a "tour of duty" was one year. After that year, you'd be transferred to a new assignment. I thought that came across quite clearly in the film, but I guess I might be wrong. We can also assume, that the drug use, wasn't happening on all the mining outposts, but this one, as we're told in the film, has record production, which we later learn, is much thanks to the use of performance enhancing drugs. To me, this suggests that O'Neil in the past, has had a very routine, "keeping the peace" type job, and only this time runs into something more sinister. The reason he takes this job so serious, or rather personal, might be because his colleagues are taking money to look the other way, and as such are a disgrace to their duty of upholding the law. This seems likely to me at least.
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