I have added in a required user profile field when people register. It asks for the branch of the military you served with. For those who did not serve, or for those who do not wish to disclose that information you can just select None.
Since you have already registered, you can edit this information by going to your User CP and then to the Edit Profile section. You can also just goto the link below which will take you directly to the page. The option to edit is at the very top, the 2nd one down.
I figured this would be something neat for the forums to have on them. When you make a post it will display the branch you served in along with a link to the appropriate website. Check it out!!
http://www.veteransresources.org/for...do=editprofile