What do pilots major in?

Hey guys! I'm currently a junior in high school aiming to be a 67J in the Army. The time to apply for college and deciding what I'll major in is coming up, and I honestly still don't know what to major in. All I want to do is fly for the military, and maybe fly EMS helo's once I leave, but obviously that isn't a major. I've heard something in STEM may help my chances on getting branched into Medical Services, but I don't know what people who are looking to be pilots typically major in. Does anyone know what 67J's or 15A's typically major in?

Thanks to all that have answered so far! I'm really interested in chemistry, it's been my favorite class and I'm good at it, but I've been told so many times that it's extremely difficult in college and most end up with relatively lower GPA's ranging 2.8-3.2. I'm afraid my GPA would be on the lower end compared to others that majored in something a little easier and it'll end up really hurting me when it comes to the whole Order of Merit business.