I'm happy for your wife, AB. (Seriously, not sarcastically; it's always nice to come to the end of red tape.) There may be some difference based on jobs, times, I don't know. My friend is an airline transport pilot, so there may be some other issues that come into play (TSA? DHS? Dunno.)
My Dutch friend has had multiple interviews in the past several years. I'm not sure if he has met or will meet a gate where that becomes no longer necessary, but I'll ask him.
(I'm only aware of his interviews because our scheduling office kept screwing up his day off to go to the Federal Building, and he kept having to fix it.)
Anyway, I don't want to veer off into the bushes. But I am all in favor of legal resident aliens having carry rights, just like citizens.