I've spent the last 20+ years working in Corrections in Arizona. It's interesting in that I didn't really have to come out to my co-workers. I've never really flaunted it but I've never covered it up either. Most everyone I work with already knew and are extremely accepting. Several months ago, I went through a rough break up of a 16 year relationship. If it hadn't been for my supervisors and some of my staff, it would have been alot harder to deal with.
There are alot of sisters who work for corrections here in Arizona. Some are open about it, though many are not. I have known many high level administrators who have been extremely open and have been accepted. I think much of it has to do with the person herself and how she deals with others. For the most part, lesbians who are decent people and not overbearing are accepted much more readily. The only difference is that we also have inmates to consider and that we have staff who don't bother to see who's around when they're running their necks.
Anyway, would love to share experiences with anyone in the Corrections field.