Here's a smaller file and a couple of extra letters. Hope this helps. The letters were originally skewed, I've tried to straighten them out for you to view better - in case you were wondering why they are so out of whack. Thanks.
If it where not for the U I'd say Rockwell. Not many others with that RA combination around. Mainly rip-offs.
I'm having a hard time identifying this font. Maybe one of you experts can nail it down. Thanks so much!