All excellent questions. I believe there was a brief discussion on another thread a few months ago.
Apparently, aTm is one of six universities in the US that are considered SENIOR Military Colleges under 10 U.S.C. Sec. 2111a(f).
The six SMCs are:
Norwich University (never heard of it)
The Citadel (duh)
VMI (duh)
VaTech (figures)
University of North Georgia in Dahlonega (who knew)
aTm
Other ROTC programs are authorized under a separate section of the US Code, but the SMCs apparently have some extra rules. The most interesting one that I noted was that "all physically fit undergraduate students must take courses in military training.". That seems like it would be a very hard rule to apply at a school of 60,000 undergrads, but who am I to judge.
The part that we all SEE is the "Corps of Cadets" at aTm. It was mandatory until 1965, now there are just 2500 members out of 60K undergrads. I found this bit to be unusual, you can be in the Corps of Cadets without being in ROTC.
But, yeah, I find the whole thing to be...strange...