Which is a better experience prior to working in a Prison, ICU or Emergency Room?

Thank you LORY and DEVO. Im about to graduate in December and wanted to know where to try to get myself into. I wanna get a strong year of experience before I join the USPHS and TRY to enter the federal prison system (as a worker that is!). I totally understood that the ER would be too high tech for a prison but I found I enjoyed the ICU slightly better than ER but if Im thinking of WHERE I wanna end up, I gotta go ER. My only rationale for ICU over ER is MOST nurses I've spoke with (I've worked in a hospital as a nurse-tech for over a year) tell me "if you can do ICU, you can go ANYWHERE". Sorry if this sparks ANOTHER post.
FATALLY yours, Cowboy Thug