[CentOS] Where to change login screen options

Fri Jun 6 14:34:11 UTC 2014
Wes James <comptekki at icloud.com>

I've looked around in the menus and googled this, but I can't find a way to make the login require a username instead of just showing the available users to select from.  Where do I change this?  I'm using CentOS 6.5.