I dont know anyone personally (or that I can think of) that holds dual membership. I dont think it'd be much different from being in a a social fraternity/sorority and being a member of APO or GSS. I know a lot of people in that situation.

I do agree that it would probably be difficult to pledge APO and GSS at the same time. On some campuses probably impossible.

I would be interested to meet a dual APO/GSS from a HBCU.

They only two people that I personally know of who hold membership in both are Riz Shavelle, who as I understand it joined APO first as part of the rechartering effort at Penn and then GSS after she went to Drexel for grad school (Drexel's APO chapter was all male) and GSS past president Lynne Mowers who I believe became an Alpha Phi Omega brother when she became advisor to the APO chapter at Syracuse.

Neither of these women pledged both as an undergrad...

I'd love to talk to anyone who pledged one while an active undergraduate member of the other...