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At my husband's OCS graduation, there was no limit on how many people you could have attend. That said, he only invited his parents and a couple of close friends.
I think there was a five person invitation limit. That is, each candidate could only get five hard copy invitations sent out, and if you wanted more sent out, you had to find someone who didn't use all five. That being said, nothing could stop you from calling or emailing others. Anyway, things may have changed, but that's the way it was done for us