Yes, there are cultures where being on time just isn't a thing. Telling someone to be there at 9:00 a.m. might mean sometime around then, while in the U.S., in a professional or an educational environment, it means 9:00 a.m. or a bit earlier just to be safe. There is a cultural difference at work here.When in America, do what Americans do. The people who demonstrate a proper understanding of American conventions might have enough ability to grasp the niceties of working with others, elsewhere, who do things differently. The people who get away with, well, whatever, are likely to, when elsewhere, attempt to get away with, well, whatever, and they'll queer the deal. First demonstrate competence with your own institutions, then send trusted competent people into settings elsewhere.
Yes, the United States has its own culture. It's based on charity, responsibility, achievement, and high expectations -- all the things that lead directly from being blessed with liberty.For extra pedagogical oomph: hire football players of color as the trainers. And let the people who show up late for training take a lap first. Oh, wait ... that's the next front for the social justice warriors, is using exercise as punishment logical?
Maybe Clemson should invest in training for people who can't show up on time. That would be the start of the fastest road to success for anyone, no matter the background.