Thanks for the tips, well noted. I do disagree with "not wearing" a suit though. One of the guys that interviewd me was wearing a suit. I didn't wear a suit, but I did wear a tie, dress shirt and dress pants and nice shoes (no one wore work boots the day I interviewed) so it was business attire. Not everyone there had a tie on, but I'd say half of them did. It sounds as if you were interviewed over two years ago....they have changed the process up a bit with structured questions with one individual from HR and one from the union office. So, I would say a suit won't hurt you, go business casual. The union rep at my interview was dressed business casual....no tie, but dress shirt, slacks and nice shoes.