It is obvious that with those size of Members as was said, there will be a lot that dont know each other, How Sad!
I would also feel fulish if I were walking across Campus and see someone with letters and ask if they are a Member From My Chapter, a transfer, or just visiting.
I never knew a time with a My @ 60 Man Chapter that all didnt know each another.
Liken it to Eng or Math 101 meeting in an amphitheater with 100-200 + students. Just a Number, not a true learning student according to your Instructor.