Well, at WP 25 years ago we definitely all said ROT-C. Wasn't until I went out in the "real" Army that I found that most prior ROTC members found that a derogatory way of saying it - kind of a way of West Pointers looking down on them. We've of course always said it as ROT-C just by habit in the house but that was something my son was corrected on at his first BGO interview and we then had to work to get him to change, to say R.O.T.C. instead so that he didn't offend anyone at an interview board or similar. I think as HMQ said, it's more respectful.