I'm proof that you can be a member of both. Neither organization, on a national level, has a prohibition to cross-membership. A few of GSS's founders were in NPCs already.
ree-Xi, thank you for clarifying that for me. I actually contemplated joining GSS, even though I am an NPC member, because I am VERY involved with the Alumnae Chapters of Phi Mu and love community service. I'm still thinking about it.
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