I also got to inform a returning Iraq vet that they couldn't take my course, which resulted in this vet most likely not being able to transfer (to a school they were already admitted to) in the spring. I'd had this student in my class a few years ago when they got called up mid-semester, and now this student wanted to complete the course. Unfortunately, this student needed a few courses other than mine to transfer, and the course schedules conflicted. The student was begging me to do some kind of workaround, anything to let them transfer, but I had to sit there and tell them that no, there was no workaround. So this student survived the hell of Iraq, only to come back to the states and find some puny rules-stickler prof standing in the way of their education. It didn't feel good.
And then, during one of my labs, I heard a line that nobody teaching a second-semester biology majors course ever wants to hear: