Hi Dar,
Here's a forum with members who are active in SAR, Therapy, and Service Dogs. Granted it's a forum for german shepherd fanciers, but it offers great information here. Scroll down towards the bottom of the page and you'll see it listed under Working Dogs:
www.germanshepherds.com
I know SAR takes a really dedicated individual and you'll need to train most weekends. Also, you will need to consider that if you chose to be in SAR, you may get called out at any time, in any weather conditions, and you may have to foot the expense of travel on your own.
Good luck and let me know if I can help you with anything else,
Cathy