bash profile question

Hello,
I'm new to RHEL and I was wondering where the prompt setup is from?
This what it looks like:
[username@servername directory]#
I like this setup but I would like to add some color to it. I looked in the .profile, .bash_profile and .bashrc. I don't see anything in these files that give me the above prompt. So I looked in /etc/skel and I don't see anything there ether. Where do I need to go to find what I'm looking for?
I usually add a export PS1 line in my .profile or .bashrc file to get the above with color, on UNIX servers. What am I missing?

Thanks.

check /etc/profile.d/

See if anything references it there. Alternately /etc/profile.

Thanks I'm looking at this file as well as /etc/bashrc