I don't know how being a US citizen would make a difference (other than getting deported before you finish the class). I would say it depends on if there's an opening, who you know (politics - because everyone wants their brother/sister, cousin, 2nd cousin, etc to get a job as an RCT), and of course - can you pay for it. Also, there's around 700 RCTs here already and when the 'stimulus' money is gone the RCTs with the least 'seniority' will be looking for work. Not trying to steer you in a different direction, but for around $3600 bucks you could get three weeks of training (including Advanced Mixed Waste Training) as a Waste Shipper which is also in demand at Hanford. Just make sure when you do get your citizenship that you keep a copy of it and your previous work history because you'll need it everytime you apply for a nuclear related job. Hope this helps and good luck.