I've never heard of a university having mandatory PE. Sounds ridiculous to me. University students are adults, they can decide for themselves if they want to exercise.
Hmm, Soldiers are adults, but they usually have mandatory PE. But I suppose they are volunteers. If only our students weren't conscripted into their educations.
Obviously, the requirements of being a soldier are comparable to the requirements of being a student, so it makes perfect sense if both have mandatory PE. Or not.
The requirements for being a soldier are determined entirely by the institutions which select people to be soldiers. So you'd imagine that if a school required it's students to do PE, they'd have just as strong of requirements as soldiers do.