I think it will depend on your starting point. I don't believe AFROTC has specific major requirements however STEM and Foreign Languages are preferred. If you have a major outside of those two areas, changing into those areas is probably "pretty easy". Moving within those two areas is possible but will require some effort. Moving out of those two areas, while not impossible, will be difficult. However your major can be a choice you make for your life. Many people on this forum are in careers because of the sunk cost of school majors and early life choices, take advantage of your youth. If this is important to you then be sure to explore your options.